Top 10 Factors: 90791 vs 90837 Reimbursement
You’re staring at two CPT codes and wondering which one will line your pocket higher. Below is a quick‑hit list that breaks down the pay, paperwork and pitfalls of 90791 and 90837 (part of the AMA CPT code set) so you can decide where to focus your schedule.
Table of Contents
- 1. MCM South Medical Billing Service, LLC (Our Top Pick) , Maximize Reimbursement for Both Codes
- 2. Direct Reimbursement Rates , 90791 vs 90837 Per-Session Payout
- 3. Time Investment vs. Payout , 60 Minutes vs. 90‑Plus Minutes
- 4. Credential and License Requirements , Who Can Bill Each Code
- 5. Documentation and Coding Guidelines , Avoiding Denials
- 6. Payer‑Specific Rate Differences , Medicare, Medicaid, and Commercial Insurers
- 7. Telehealth and Modifier Considerations , Post‑2026 Parity
- 8. Frequency and Utilization Limits , How Often You Can Bill
- 9. Denial Management Strategies for Both Codes
- 10. Real‑World Case Studies , Which Code Earns More in Practice?
- How to Choose the Right Option
- Watch: CPT 90791 & 90837 Explained
- En Español
1. MCM South Medical Billing Service, LLC (Our Top Pick) , Maximize Reimbursement for Both Codes
MCM South handles every step of the revenue cycle for solo therapists, small groups and psychiatrists. We verify eligibility, scrub claims, chase denials and deliver detailed reports so you can see more patients instead of paperwork.
Our team knows the quirks of both 90791 and 90837. We match each claim to the payer’s allowed rate, add the correct modifiers and make sure the time‑stamp is crystal clear. That precision lifts the average per‑minute payout and cuts the denial rate dramatically.
When you partner with us, you get a single point of contact who speaks insurance, so you don’t have to. We also integrate with your EHR to pull timestamps automatically.
Ready to stop guessing which code will pay more? Explore our billing services and see a free audit of your current claim mix.
2. Direct Reimbursement Rates , 90791 vs 90837 Per-Session Payout
Medicare and many state Medicaid plans publish their fee schedules, and you can verify the current figures on the CMS Physician Fee Schedule. That makes the diagnostic evaluation the higher‑paying code on Medicare.
Private insurers show a wider spread. The high end of 90837 can outpace the low end of 90791, but the average per‑minute revenue still favors the shorter evaluation.
3.30per‑minute payout for 90791 (Medicare)
Those numbers mean you earn about $3.30 for every minute spent on a 90791 evaluation, compared with $2.77 per minute on a full 90837 session.
3. Time Investment vs. Payout , 60 Minutes vs. 90‑Plus Minutes
90791 usually runs 45‑60 minutes. Because there’s no strict time rule, you can stretch a complex intake to 90 minutes if needed and still bill the same code.
90837 demands at least 53 minutes of face‑to‑face psychotherapy. Anything less drops you to 90834, as detailed in our CPT 90834 vs 90837 comparison. The extra minutes boost total revenue, but the per‑minute return drops.
Think of it this way: a 60‑minute 90791 and a 60‑minute 90837 have different per‑minute reimbursement rates. If you can squeeze two 90791s into the time you’d spend on one 90837, the diagnostic code wins on efficiency.
4. Credential and License Requirements , Who Can Bill Each Code
Both codes can be billed by any licensed mental‑health clinician who is authorized to diagnose or provide psychotherapy. That includes psychiatrists (MD/DO), psychologists (PhD/PsyD), LCSWs, LPCs, LMFTs, psychiatric nurse practitioners and even nationally certified counselors.
90791 is strictly an evaluation without medical services, so any provider who can perform a diagnostic interview may bill it. 90837 is a psychotherapy service, so the provider must be delivering a talk‑therapy intervention. A psychiatrist who only prescribes medication would need to add an E/M code, not 90837 alone.
Some payers limit the frequency. Medicare and most commercial plans allow one 90791 per episode of care, often once per year unless there’s a significant clinical change. 90837 can be billed as often as medically necessary, but unusually high frequency may trigger a medical‑necessity review.
5. Documentation and Coding Guidelines , Avoiding Denials
Denials often stem from missing timestamps or vague progress notes. For 90791, document a full intake: presenting problem, HPI, psychosocial history, mental status exam, provisional diagnosis and a clear treatment plan. Note the start and stop time even though the code isn’t time‑based. For a deeper dive, see our guide on how to document outpatient mental health CPT codes and review the APA psychotherapy documentation guidance.
For 90837, record exact minutes spent (e.g., 00:55:12). List the therapeutic techniques used, patient response, any risk assessment and the next steps. Include the appropriate telehealth modifier (95 or GT) if the session was virtual.
Our claim‑scrubbing engine catches missing minutes, wrong modifiers and unapproved diagnosis codes before the claim leaves your practice. That pre‑flight check reduces denial rates dramatically, and pairing it with a clean therapy superbill template keeps your records audit‑ready.
Read more about claim submission best practices in our claims submission guide.
6. Payer‑Specific Rate Differences , Medicare, Medicaid, and Commercial Insurers
Medicare treats both codes as outpatient mental health services, but the fee schedule favors the evaluation. Medicaid rates vary by state; some states pay the same for both, while others give a bonus to longer therapy.
Commercial insurers negotiate contracts. Before assuming a code’s value, check your patient’s insurance benefits for specific coverage details. Large networks like UnitedHealthcare often match Medicare for 90791 but pay a premium for 90837. Blue Cross plans may cap 90791 and pay a higher rate for 90837.
When you work with MCM South, one of the best mental health billing companies for private practice, we run a payer‑mix analysis each quarter. That lets you see which codes drive the most dollars for each contract and adjust your schedule accordingly.
Pro Tip: If Medicare makes up more than 40% of your panel, schedule more 90791s to boost per‑minute revenue.
7. Telehealth and Modifier Considerations , Post‑2026 Parity
After the 2026 parity rule, Medicare reimburses telehealth at the same rate as in‑person for both codes, provided you attach modifier 95 (interactive video) or GT (interactive audio‑video). Private payers largely follow suit, but a few still require a separate authorization for tele‑psychotherapy.
Make sure your EHR captures the platform used (Zoom, other video platforms, etc.) and that the patient consent is documented. Missing that detail can trigger a denial even if the rest of the claim is perfect.
8. Frequency and Utilization Limits , How Often You Can Bill
90791 is typically limited to one per patient per episode of care. Some insurers allow a second evaluation if there’s a major change in symptoms or a new diagnosis.
90837 has no set limit, but insurers may flag unusually frequent long sessions (e.g., three 90837s in a week) for medical‑necessity review. Keep your treatment plan up‑to‑date and attach progress notes that justify the frequency.
9. Denial Management Strategies for Both Codes
First, run every claim through a clearinghouse that does real‑time scrubbing. It will catch missing NPI numbers, wrong modifiers and mismatched diagnosis‑code pairs before the payer sees the claim.
If a claim is denied, pull the denial code and compare it to the payer’s policy. Common reasons include missing start‑stop times for 90837 or lacking a documented medical necessity for 90791.
Draft a concise appeal that references the specific policy language, includes the corrected claim and any supporting notes. Our team can generate a template appeal letter within minutes.
10. Real‑World Case Studies , Which Code Earns More in Practice?
Practice A (solo LPC, Medicare‑heavy) ran a pilot where 30% of their slots were 90791 and 70% were 90837. Over six months, the per‑patient revenue rose 12% because the higher‑per‑minute 90791 slots freed up capacity for more new intakes.
Practice B (group LCSW, commercial‑heavy) swapped 20% of their 90837 slots for 90791 to test the hypothesis. Their average reimbursement per hour dropped 5% because the private contracts paid a lower ceiling on 90791. They reverted to the original mix.
The takeaway: your payer mix decides which code maximizes revenue. If Medicare dominates, lean into 90791. If private contracts dominate, prioritize 90837.
How to Choose the Right Option
- Check your payer mix. >40% Medicare? Favor 90791.
- Look at average reimbursement per minute for each code in your contracts.
- Assess your scheduling capacity. Can you fit more short evaluations?
- Consider clinical needs. Complex cases may require longer therapy.
- Use a billing partner that can track and adjust mix in real time.
Watch: CPT 90791 & 90837 Explained
Cracking the Code: Understanding CPT 90791
The Value of CPT Code 90837
Time requirements for CPT codes in behavioral health by MCMSouth
En Español
Descifrando el código: comprendiendo CPT 90791
El valor del código CPT 90837
Frequently Asked Questions
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Which code generally pays more per minute?
On Medicare, 90791 pays about $3.30 per minute while 90837 pays roughly $2.77 per minute, making the diagnostic evaluation the higher‑per‑minute payer.
Can I bill both codes for the same patient on the same day?
No. Payers consider 90791 an initial evaluation. If you provide therapy later that day, you must use a psychotherapy code like 90834 or 90837, not another 90791.
Do telehealth visits affect reimbursement?
After 2026, Medicare reimburses telehealth at the same rate as in‑person for both codes if you add the correct modifier (95 or GT). Some commercial plans still require prior authorization.
How often can I bill 90791?
Typically once per patient per episode of care, and many insurers limit it to once per year unless there’s a significant clinical change.
What’s the best way to avoid denials?
Use a clearinghouse that scrubs claims, document exact start‑stop times for 90837, include all required modifiers, and keep a clear medical‑necessity note for 90791.
Is it worth outsourcing my billing?
Outsourcing to a specialist like MCM South saves time, reduces denials and lets you focus on patient care while maximizing reimbursement for both codes.
Start your free trial with MCM South today and see how much more you can earn from the same schedule.
Ready to boost your practice revenue? Learn how to master 90791 and compare 90837 to other therapy codes for a full picture.