From F33.1 Billing to Reimbursement: How Accurate Coding Can Support Cleaner Claims

Only the diagnosis codes cannot meet the behavioral health claims requirements. Diagnosis, clinical record, psychotherapy services, time, medical need, and the insurance requirement have to be documented through the claim form. The code F33.1 is used for diagnosing recurrent depressive disorder with moderate episodes. It helps to distinguish recurrent depression from an episode of depression.

Correct diagnosis reporting doesn’t ensure reimbursement. But the correct coding helps ensure the diagnosis is consistent with the provider’s documented assessment on the claim. The entire claim is important by CMS data. Medicare’s outlier psychiatry service improper payment rate for the 2024 reporting period was 16.1%. The estimated number of improper payments was $254.5 million.

What Does F33.1 Mean in Medical Billing?

Recurrent depressive disorder with a current moderate episode (F33.1) is the classification for major depression disorder with more than one episode. The classification is used for recurrent depressive episodes and to classify the current episode as moderate in severity.

The diagnosis has three key components:

• Major depressive disorder
• Recurrent depressive pattern
• Moderate current episode

It should not be selected simply because a note mentions having moderate depression, billing staff should be careful not to select this diagnosis. It also should be accompanied by documentation of a recurrent nature. F32.1 is used when someone experiences moderate depression once. The diagnosis is a recurrent one and is a different clinical pattern, so the provider’s assessment should reinforce the difference.

How Does It Differ From F32.1?

The point is, the depression pattern which is documented is the one that is unique. Moderate depression is represented in both codes, but is not the same diagnosis pattern.

Patients with a moderate first or only episode may not be documented as such and so may not qualify for a re-diagnosis. If the provider has made this assessment and documented moderate take-home episodes of depression and an ongoing moderate episode, then it is acceptable to use the recurrent code. Instead of individual terms of the treatment note, billing employees read the assessment made by the provider.

How Does Diagnosis Coding Connect With Reimbursement?

There are multiple elements to a behavioral health claim. The diagnosis code is used to denote the diagnosis, and the CPT code is used to denote the service rendered. Both are documented with the medical record. Medical records submitted must be submitted to support the ICD-10-CM and CPT or HCPCS codes on a claim, CMS states.

The usual steps in a billing workflow:

• Clinical assessment
• Documented diagnosis
• ICD-10-CM coding
• Service provided
• CPT or HCPCS coding
• Documentation review
• Claim submission
• Payer review
• Payment or denial

There is a different purpose for each step. The diagnosis is not an alternative to the psychotherapy CPT code and the CPT code is not an alternative to clinical documentation. A therapist, for instance, could give each patient with recurrent moderate major depression individual psychotherapy. The claim might also contain the diagnosis and a psychotherapy CPT code that corresponds to the documented service and time. The diagnosis gives the message about what is being treated. The CPT code will give information about service rendered.

Does the Diagnosis Alone Support Reimbursement?

No. The diagnosis for the condition reported on the claim is not enough to establish that all other requirements from each of the payers has been met. The most recent CMS outpatient psychiatric data for 2024 highlights the need to review the full claim. The overall improper payment rate was 16.1% and the estimated improper payment rate was $254.5 million.

Among the improper payments, CMS identified the following causes:

These percentages are not the denial rate for diagnosis of these claims. They report on the reasons for the improper payments for outpatient psychiatry services that were found in CMS’s 2024 reporting period. 78.3% of those improper payments were due to insufficient documentation. Incorrect coding was responsible for 2.6%. The figures illustrate the need to consider diagnosis coding in the context of documentation. Correct coding and proper supporting documentation is key to billing accuracy.

A payer may also review:

• Medical necessity
• Clinical documentation
• CPT code selection
• Psychotherapy time
• Provider eligibility
• Coverage requirements
• Authorization requirements
• Place of service
• Payer-specific billing rules

What Documentation Should Support the Diagnosis?

The clinical record should be available to set up a diagnosis and service reported. Billing teams should consider the following documentation: treatment received, current severity of depression, recurrent depression and billed service. The best review is one that is based upon what the provider actually documents. These clinical information and procedures should be entered into the clinical note, and staff should refer to the clinical note to check against the diagnosis and procedures submitted.

Symptoms and Functional Impact

From a clinical perspective, it may be helpful to record clinically relevant symptoms and the impact of those on functioning if they are present. This information contains clinical information of the condition to be treated. If the depression is moderate and recurring, then the documentation should help substantiate the provider’s evaluation. The billing code should be based on that evaluation and not be the evaluation itself.

Treatment Goals and Progress

Treatment Notes include patient progress/outcomes addressed, as well as goals. Progress documentation can assist in understanding the necessity of continued therapies and whether or not it is the appropriate therapies. Treatment notes should have uniformity with regard to progress information for billing teams. Changes in symptoms and treatment should be documented (if relevant to clinical cases).

Medical Necessity

Medical necessity connects the medical condition in the medical beneficence history to the service provided. Diagnosis is not enough evidence for medical necessity determinations for a specific psychotherapy service. The clinical record should be used to back up the reason for the treatment and the service rendered. This connection should be checked by billing staff prior to claim submission.

Therapeutic Interventions

If the patient received psychotherapy/therapeutic interventions, the note should include reference to those interventions. All of these interventions should be tied to the patient’s treatment objectives and should be clinically documented treatment needs. There should be clarification on documentation about the service provided in session. Not matching up the treatment note and billed service may lead to additional claim questions.

Patient Response

For patients, if applicable, the provider should note the patient’s reaction to treatment. This may involve changes in symptoms, achieving goals, challenges to medication or changes to treatment. Regular progress and response information is provided to link treatment and condition. Billing teams should review claims for gaps/inconsistencies.

Time Documentation

Therapy codes have a specific rate of time. CMS identifies 16 to 37 minutes for 90832, 38 to 52 minutes for 90834, and 53 minutes or more for 90837. In addition, CMS also indicates that start and stop times or total psychotherapy time should be documented for these services. Applicable psychotherapy time should be documented separately from E/M time for combined psychotherapy and E/M services. Billing staff should review the actual time to the CPT code reported. This check can pinpoint service and documentation mismatches before they are submitted.

Which Psychotherapy CPT Codes Can Accompany the Diagnosis?

Diagnosis codes will denote the condition and Psychotherapy codes will denote the type of psychotherapy. CMS has established three codes for psychotherapy (without medical management): 90832, 90834 and 90837. Additionally, CMS also provides codes for psychotherapy provided during an E/M service, including 90833, 90836 and 90838. The CPT code does not depend on the diagnosis. For instance, a diagnosis alone is not an indication for 90837. The provider shall record the psychotherapy services and time. The medical record should also be documented to substantiate any E/M service performed with psychotherapy. Bills teams need to check the diagnosis, procedure code, documentation and time together.

Example 1: F33.1 Versus F32.1

The patient has a moderate depressive episode but denies any history to support a diagnosis of recurrent depression disorder. If the provider’s assessment shows a moderate episode, then F32.1 could be a more appropriate code. The results offer still valuable evidence for the behavioral health billing team. They bring to light the financial repercussions of failing to meet the psychotherapy billing requirements.

Example 2: Documentation Does Not Support F33.1

In the treatment note, only depressive symptoms are documented and moderate severity is noted, but a claim does include F33.1.  The billing team should not assume the diagnosis is supported. The claim should be reviewed against the provider’s documentation before submission.

How Can Documentation Errors Affect F33.1 Claims?

CMS’s actual data show that documentation deserves close attention. For outpatient psychiatry in the 2024 reporting period, insufficient documentation accounted for 78.3% of improper payments. No documentation accounted for another 17%. Incorrect coding accounted for 2.6% of identified improper payments. These figures show that documentation-related problems represented a much larger share of identified improper payments than incorrect coding.

Common documentation problems include:

• Unsupported diagnosis
• Missing psychotherapy time
• Weak medical necessity documentation
• Incomplete treatment notes
• Missing provider signatures
• CPT and documentation mismatches
• Insufficient progress documentation
• Inconsistent information across the medical record

When it comes to the CMS numbers, they don’t indicate that 78.3% of all psychiatry claims were rejected. They report the distribution of known reasons for improper payment on the 2024 outpatient psychiatry measurement. Billing teams should review coding and documentation for behavioral health claims, as well. The service should reflect the provider’s assessment, and F33.1 should reflect the service.

What Does Medicare Improper-Payment Data Reveal About Psychotherapy?

Medicare psychotherapy payments March 2020 to February 2021 were reviewed in a separate HHS office of inspector audit. In that time, Medicare Part B covered just over 13.5 million psychotherapy visits for an average of about $1 billion. OIG reviewed 216 sampled enrollee days. Providers met Medicare requirements for 84 of those days but did not meet requirements for 128 days. OIG identified issues that included missing psychotherapy time documentation. Based on the audit sample, OIG estimated that $580 million of the approximately $1 billion in psychotherapy payments were improper.

The estimate included:

• $348 million for telehealth services
• $232 million for non-telehealth services

The numbers do not apply to F33.1 only. They expand upon Medicare psychotherapy more generally. The results offer still valuable evidence for the behavioral health billing team. They illustrate the economic consequences of noncompliance with the psychotherapy billing criteria. System edits and provider education were recommended by OIG to reduce inappropriate psychotherapy services, along with a medical reviews alignment.

What Is the Depression Screening ICD 10 Code?

It is important to note that depression screening and diagnosis coding are not synonymous. ICD-10-CM has a screening for depression (adult and child/adolescent depression screening) under Z13.31, which is an encounter for screening. A screening code is a code that explains why the screening encounter was performed. Does not supplant the diagnosis of a confirmed depressive disorder when a provider has made the diagnosis.

For instance, a depression screening may be reported for a patient as an encounter (Z13.31) in addition to the depression diagnosis. F33.1 may be used when the documentation supports a diagnosis of recurrent moderate depressive disorder if this diagnosis is made by the provider. This difference is important when preparing claims. The code should be based on the code in the documentation provided by the provider and the reason for the encounter, such as the problem or service being provided.

F33.1 Claim-Scrubbing Checklist for Billing Teams

A pre-submission review can help you find inconsistencies before the claim is submitted to the payer. The review should be based on the reported data as provided on the claim and the documentation provided.

Verify the Diagnosis

Check whether:

• The provider documented the diagnosis.
• The record supports recurrent depression.
• The record supports the reported severity.
• F33.1 matches the provider’s assessment.
• Another diagnosis better matches the documented condition.

Verify the Service

Review:

• CPT code selection
• Service type
• Documented psychotherapy time
• E/M requirements when applicable
• Provider information
• Place of service
• Required modifiers

Verify the Documentation

Check for:

• Relevant symptoms
• Functional impact
• Treatment goals
• Interventions
• Patient response
• Treatment progress
• Medical necessity
• Required time documentation
• Provider authentication

Verify Payer Requirements

Review the applicable payer’s requirements for:

• Coverage
• Authorization
• Provider participation
• Behavioral health benefits
• Claim submission
• Documentation
• Modifiers
• Place of service

Do not assume Medicare requirements equal all other payers, Medicaid or commercial payers. The correct rules based on date of service and date of payer should be followed – the billing team will need to make sure this is in order.

Common F33.1 Billing Mistakes to Avoid

1. Confusing F33.1 With F32.1

F32.1 and F33.1 are expressions of “moderate” depression, but they apply to different “diagnostic patterns.” There is one for an acute (single) episode and one for multiple depressive episodes (recurrent depressive disorder). Again, as with selecting a diagnosis, the same review should be done for the diagnosis. The case should not have only moderate depression if there is no recurrent depression/status.

2. Treating F33.1 as a Procedure Code

F33.1 is a diagnosis of the patient’s condition, rather than the service the patient received. It does not specify a psychotherapy or another billable service for that encounter. The correct CPT code should be used to report the actual service rendered. The documentation should serve to support that service.

3. Selecting a CPT Code Without Checking Time

CMS assigns time periods to psychotherapy codes. If all other requirements are met, then a documented psychotherapy service of 55 minutes is considered to be in the 53 minutes or more range for 90837. The range for 90832 is 16-37 minutes, and 35 minutes is in this range. The billing team should match the documented service time with the CPT code reported.

4. Assuming F33.1 Establishes Medical Necessity

A diagnosis does not, in itself, show medical necessity for a specific psychotherapy service. The clinical record should provide evidence as to the need for treatment and the service provided. When a child has a documented condition, the treatment offered should be related to that condition. Billing staff should check that connection prior to submitting the claim.

5. Ignoring Payer-Specific Requirements

Some coverage and billing specifications may be different among Medicare, Medicaid and private insurers. An information that is accepted by one insurer may need extra information from another. The billing department should make sure about the specifications of each provider and the day when he or she provided services to the patient. The team should be aware that if there is a specification in one plan then it applies to every plan.

6. Submitting Inconsistent Documentation

All the information should be consistent about the diagnosis, the treatment note, CPT and the claim. For example, if there is no documentation that supports the psychotherapy time requirement, the claim cannot be 90837. Similarly to selecting a diagnosis, the same review needs to be completed for the diagnosis as well. If there is no recurrent depression no mention should have been made of moderate depression, and code F33.1 may not be used.

How Accurate Diagnosis Coding Supports Cleaner Claims

Coding of diseases gives a common diagnostic basis for a claim. On the basis of the CMS analysis, the incorrectly coded outpatient psychiatric services accounted for 2.6% of all improper payments in 2024.

Better Diagnosis Consistency

The claim’s diagnosis must be the same as the provider’s diagnosis documented in the claim. If a moderate episode is in progress, the record should document both the ongoing pattern and the current episode for F33.1. This will maintain uniformity in the clinical record and claims. It also provides the billing staff with a strong foundation for checking the diagnosis prior to submission.

Stronger Medical Necessity Support

The documented diagnosis provides clinical background information for the reviewer. Even though the treatment record has the diagnosis, the treatment record will have to justify the necessity of the service in relation to the patient’s documented condition. F33.1 needs to align with the documented treatment. The treatment record will have to justify the service provided and not just the diagnosis code.

Fewer Coding Mismatches

Using the right diagnosis helps differentiate between the similar depressive disorder diagnosis codes. The difference between F32.1 and F33.1 is very crucial since the two refer to moderate depression but different diagnostic patterns. Checking the diagnosis against the provider’s diagnosis helps in making such distinctions before sending out the claim. This is especially helpful in cases where similar diagnoses exist in the billing process of the practice.

Better Pre-Submission Review

A claim-scrubbing process can compare F33.1, the CPT code, documented time, and supporting documentation. The billing team can then identify mismatches before the claim reaches the payer. This review does not guarantee payment. It creates an opportunity to correct errors before they become claim problems.

When Should a Billing Team Review a F33.1 Claim?

A claim deserves additional review when:

• The diagnosis recently changed.
• The provider documents a change in severity.
• The treatment plan changes.
• A different psychotherapy CPT code is selected.
• Psychotherapy and E/M services are billed together.
• Time documentation is missing.
• Medical necessity is unclear.
• A previous claim was denied.
• Payer requirements have changed.
• The documentation and claim contain inconsistent information.

A claim scrub could match F33.1, the CPT code, time, and evidence. At that point, the billing department will recognize disparities prior to submitting claims. Such a review does not ensure claims payments. On the contrary, such a review provides a chance to fix any mistakes in advance. This review could match the billed service with the treatment note. All discrepancies have to be solved before claims submission.

How Billing Care Solutions Can Support Behavioral Health Claims

There are many factors that go into making behavioral health claims. The diagnosis needs to match the medical records, and the CPT code, the service itself. Psychological services codes based on time require time evidence documentation. Payer-specific guidelines need to be reviewed separately.

Billing Care Solutions can support practices with revenue cycle processes such as:

• Behavioral health medical billing
• ICD-10-CM coding support
• CPT coding support
• Claim scrubbing
• Documentation review
• Denial management
• Accounts receivable follow-up
• Payer follow-up
• Payment posting
• Revenue cycle reporting

The objective is to perform pre-review and post-review of the claim. In case of behavioral health claims, this would involve verification of diagnosis, documentation, psychotherapy service, time involved, and payer requirements.

Final Takeaway

F33.1 is used to identify major depressive disorder, recurrent, moderate. This is significant for the diagnosis of behavioral health claims, but it does not make any case eligible for reimbursement on its own. The CMS improper payment rate for outpatient psychiatry was 16.1% for the 2024 reporting period. The amount of the improper payment projection is $254.5 million. The lack of proper documentation was responsible for 78.3% of such improper payments, while incorrect coding represented 2.6% and demonstrated the importance of reviewing both documentation and coding.

OIG’s psychotherapy audit also found substantial payment problems. The audit reviewed more than 13.5 million psychotherapy services involving approximately $1 billion in Medicare Part B payments. Improper payments of $580 million were projected by OIG in the services reviewed. This is not specific to F33.1 and therefore should not be used as a diagnosis-specific denial rate.

In behavioral health billing, billing teams must review four basic areas:

• Whether the diagnosis fits the provider’s notes.
• Whether the CPT codes match the service.
• The documented time supports applicable time-based psychotherapy codes.
• This claim satisfies the relevant payer’s criteria.

Where coding, documentation, coding of services, and payer criteria match, there will be a better basis to file and adjudicate claims.

Frequently Asked Questions