How Often You Can Bill Medicaid for Individual Therapy Sessions

Code 90833 billing frequency under Medicaid

Code 90833 is a 30-minute individual psychotherapy session. Most state Medicaid programs allow you to bill it once per day, and some allow it multiple times per day if the sessions are clinically separate and documented as such. However, the rules vary significantly by state — your state Medicaid agency sets the limit, not Medicare or a federal standard. You need to check your specific state's fee schedule and billing guidelines, because billing more than your state allows can trigger claim denials, recoupments, or fraud investigations.

The frequency limit is separate from prior authorization requirements. Even if your state allows daily billing, you may still need pre-approval for a certain number of sessions per month or year. Some states cap the total sessions covered in a benefit period regardless of how often you bill per day.

Key Takeaways

Code 90833 frequency limits are set by your state Medicaid program, not by federal rules, so you must verify the limit in your state's billing manual.
Most states allow one 90833 per day per patient, but some allow multiple sessions on the same day if they are clinically distinct and properly documented.
Prior authorization and session caps are separate restrictions — you may be allowed to bill daily but still need approval for a certain number of sessions per month.
Billing more than your state allows can result in denied claims, demands for repayment, or referral to fraud investigation.

How state Medicaid programs set billing limits

Each state Medicaid agency publishes its own fee schedule and billing guidelines. These documents specify how many times you can bill a particular code in a single day, whether you need to use modifiers to distinguish separate sessions, and what documentation is required to support multiple billings. Some states publish this in a provider manual; others post it on their Medicaid website or require you to call the provider line.

The limit is usually tied to clinical necessity and the patient's treatment plan. A state might allow one 90833 per day as a standard, but permit two or more if the patient's condition requires intensive treatment and the sessions are documented as separate clinical encounters — for example, a morning crisis intervention session and an afternoon follow-up. However, the burden is on you to prove that each session was medically necessary and distinct.

If your state's guidelines are unclear, contact your state Medicaid agency's provider services line directly. Ask for the specific billing frequency limit for code 90833 and whether modifiers (such as 59 or 76) are required to bill multiple sessions on the same day. Get the answer in writing if possible, because it protects you if a claim is later denied.

Documentation requirements for multiple sessions per day

If your state allows more than one 90833 per day, you must document each session separately in the patient's medical record. Each note should include the date, time, duration, clinical reason for the session, what was addressed, and the clinical outcome. The notes must show that the sessions were distinct encounters addressing different clinical issues or representing a continuation of treatment that could not reasonably be combined into a single longer session.

Some states require you to use a modifier on the second and subsequent claims on the same day. Modifier 59 (Distinct Procedural Service) or modifier 76 (Repeat Procedure by Same Physician) tells the payer that this is a separate, clinically justified session, not a billing error. Check your state's guidelines to see which modifier, if any, is required.

Medicaid auditors review medical records against claims. If you bill two 90833s on the same day but the medical record shows only one session or shows sessions that appear to be part of a single treatment episode, the claim will be denied and you may be asked to repay it. Documentation is your only defense.

Prior authorization and session caps

Billing frequency and session limits are two different things. Your state may allow you to bill 90833 once per day, but only authorize a certain number of sessions per month or per benefit year. For example, a state might allow daily billing but cap coverage at 52 sessions per year, or require you to request additional authorization after 20 sessions.

Prior authorization rules also vary by state and sometimes by the patient's age, diagnosis, or insurance plan (some states have multiple Medicaid managed care plans with different rules). Before you begin treatment, check whether the patient's plan requires pre-approval for a course of therapy. If it does, submit the authorization request with a treatment plan that justifies the frequency and duration you are proposing.

If you bill without authorization and the plan denies the claim as not authorized, you cannot bill the patient. Medicaid rules prohibit balance-billing for denied claims. You absorb the loss.

Common billing mistakes with code 90833

The most frequent error is billing multiple sessions on the same day without proper documentation or without the required modifier. Auditors see this as either a billing mistake or an attempt to inflate claims. Even if your state allows it, sloppy documentation will trigger a denial.

Another mistake is billing 90833 when the session should be billed as a different code. Code 90834 is 45 minutes, and code 90837 is 60 minutes. If you bill 90833 for a 45-minute session, the claim may be denied as incorrect coding, or you may be underpaid. Make sure the code matches the actual session length.

A third error is billing without checking whether the patient's plan requires prior authorization. Some Medicaid managed care plans require authorization for every course of therapy; others do not. Billing without it results in a denied claim and no payment.

What to do if a claim for 90833 is denied

When a claim is denied, the explanation of benefits (EOB) will state the reason — usually "not authorized," "exceeds frequency limit," "incorrect coding," or "medical necessity not established." Read the reason carefully, because it tells you what to fix.

If the denial is for exceeding frequency, check your state's billing guidelines and your patient's authorization. If you billed within the allowed frequency and within the authorized session count, file an appeal. Include a copy of the state's billing manual showing the frequency limit and a copy of the medical record for the denied session showing it was clinically distinct and necessary.

If the denial is for lack of authorization, contact the plan to request authorization retroactively. Some plans will authorize sessions after the fact if the medical record supports medical necessity. Others will not, and the claim remains denied.

Keep records of all denials and appeals. If you see a pattern — for example, the same plan consistently denies your 90833 claims — contact your state Medicaid agency to ask whether the plan is applying the rules correctly.

Frequently Asked Questions

Can I bill 90833 twice on the same day for the same patient?

It depends on your state. Most states allow it if the sessions are clinically separate and documented as distinct encounters. You may need to use a modifier (59 or 76) on the second claim. Check your state Medicaid manual or call your state's provider line to confirm the rule and the documentation requirements.

What is the difference between code 90833 and 90834?

Code 90833 is for 30-minute sessions; code 90834 is for 45-minute sessions. Use the code that matches the actual session length. Billing the wrong code results in a denied claim or underpayment.

Do I need prior authorization before I bill 90833?

It depends on the patient's Medicaid plan. Some plans require authorization for a course of therapy before you bill any sessions; others do not. Check the patient's insurance card or call the plan's provider line before the first session. If authorization is required and you bill without it, the claim will be denied and you cannot bill the patient.

What happens if I bill more than the frequency limit allows?

The claim will be denied. If you bill repeatedly over the limit, the plan may flag your account for review and you could face recoupment demands or a fraud investigation. Always verify your state's frequency limit before billing.

Can I bill the patient if Medicaid denies the claim?

No. Medicaid rules prohibit balance-billing for denied claims. If the claim is denied, you absorb the cost. The only exception is if the patient knew in advance that the service might not be covered and signed a notice of non-coverage before the session.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.