ICD-10 Medication Management Coding Guide for Clinicians

ICD-10-CM has no diagnosis code called medication management, in either the FY2026 or the FY2027 code set. The diagnosis on the claim is the condition you treated, and the visit is billed with a CPT or HCPCS code, usually an office E/M code such as 99214.12

Z79.899, “Other long term (current) drug therapy”, is the code for long-term medication use. ICD-10-CM has no Z79 code for psychiatric drugs specifically.

The 2026 national Medicare non-facility rate, before geographic adjustment, is $135.61 for 99214 and $81.50 for the 90833 psychotherapy add-on.¹

A medication follow-up may feel straightforward until you have to code it. I find it helpful to start with two questions: What condition was treated, and what service was provided? ICD-10-CM records the diagnosis or reason for the visit, such as F33.1 for recurrent moderate major depressive disorder. There is no ICD-10-CM diagnosis code named medication management. The visit is billed with a CPT code, and Z79.899 can be added to document long-term drug therapy. Payment depends on the E/M level and whether separate psychotherapy supports the 90833 add-on.

This article is for information only and is not medical advice. Talk to a doctor or licensed clinician before starting, stopping, or changing any treatment.

Coding rules and payer policies vary, and code sets change every October 1. Confirm codes with the payer and the current CMS files before you submit.

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What is the ICD-10 code for medication management?

For a medication management visit, use the ICD-10-CM code for the condition being managed. Neither the official FY2026 code file nor the FY2027 file, which applies to encounters from October 1, 2026, includes a descriptor containing the phrase “medication management”.² ICD-10-CM codes describe diagnoses, symptoms, problems or other reasons for a visit. A procedure code reports the service itself.³

The official index directs you to Z79.899 for long-term drug therapy, Z51.81 for therapeutic drug level monitoring and Z76.0 for repeat prescriptions. It has no separate entry for antidepressants, antipsychotics, stimulants or mood stabilizers, so long-term psychiatric medication use falls under Z79.899.

Under the outpatient guidelines, list the condition chiefly responsible for the services first, followed by coexisting conditions. You can code a chronic condition at every visit where you treat it.³

The ICD-10-PCS codes named Medication Management

The separate inpatient procedure system, ICD-10-PCS, does have codes named Medication Management. GZ3ZZZZ is “Medication Management” in the Mental Health section. HZ80ZZZ to HZ89ZZZ cover “Medication Management for Substance Abuse Treatment”.⁴ These codes apply to inpatient procedures. Office and telehealth medication visits use CPT or HCPCS codes instead.⁵

Z codes used with the diagnosis

A Z code may be first-listed or secondary, depending on the encounter. The guidelines identify a short list of Z codes that may only be first-listed.³ Z79.-, Z51.81, Z76.0 and Z91.1- are not on that list.

Long term medication management: Z79.899

Z79.899, “Other long term (current) drug therapy”, is the billable ICD-10 code for long-term medication use. The guidelines use Z79 codes to show continuous use of a prescribed drug for long-term treatment or prevention.³

Z79 does not apply to a short course of medication for an acute illness or to maintenance programs that prevent withdrawal, such as methadone maintenance for opiate dependence.³ Coders often distinguish between daily scheduled medication, which gets Z79.899, and as-needed medication, which does not. The guidelines do not state that rule.

It remains unclear whether Medicare or a commercial payer will accept Z79.899 or Z76.0 as the first-listed diagnosis on a professional medication claim. The guidelines do not prohibit it, and we found no payer statement either way. Their example uses Z79.899 as an additional code for long-term antiretroviral therapy in HIV.³

Drug level monitoring and repeat prescriptions: Z51.81 and Z76.0

Z51.81 means “Encounter for therapeutic drug level monitoring”. Use it when drug level monitoring is the reason for the visit. The tabular list instructs you to pair it with any Z79 code, with instructions in both directions. The guidelines place Z51 among aftercare codes, which are generally first-listed to explain the encounter.³

Z76.0 is “Encounter for issue of repeat prescription”, which excludes repeat prescriptions for contraceptives (Z30.4-).

Missed doses and noncompliance: Z91.1 codes

The Z91.1 codes describe why a patient is not taking medication as prescribed. Z91.12- covers intentional underdosing, Z91.13- covers unintentional underdosing and Z91.14- covers other noncompliance. Each requires a sixth character. Examples include Z91.120, “Patient’s intentional underdosing of medication regimen due to financial hardship”, and Z91.148, “Patient’s other noncompliance with medication regimen for other reason”.

Underdosing codes are never first-listed. If a reduced dose caused a relapse, code the condition itself. Add the underdosing code (T36-T50, fifth or sixth character 6) and the noncompliance code that shows intent, as directed by the guidelines.³

Common diagnosis codes in medication visits

The first-listed diagnosis in most psychiatric medication visits is an F code. These FY2026 descriptors are unchanged in FY2027, and the April 1, 2026 update didn’t touch them.⁶

Choose the most specific code the record supports. An unspecified code is appropriate when it reflects what is known at that encounter. For outpatient diagnoses documented as “probable”, “suspected” or “rule out”, code the symptoms instead.³

CPT codes for the medication visit

Medication management is billed with evaluation and management (E/M) codes. The former pharmacologic management code, CPT 90862, was deleted in 2013. The APA directed psychiatrists to use the appropriate E/M code instead.⁷

The rates below are 2026 national Medicare non-facility payments, before geographic adjustment, using the non-QPP conversion factor of $33.4009.¹

New patients use 99202 to 99205. For the psychotherapy-only codes, see our guide to CPT codes for psychotherapy.

Choosing the E/M level: MDM or time

Choose the office E/M level using medical decision making (MDM) or total time on the date of the visit. For MDM, two of three elements must meet or exceed the level: problems addressed, data reviewed and analyzed, and risk of patient management.⁸

The AMA lists prescription drug management as an example of moderate risk. Moderate MDM supports 99214 or 99204. To meet the moderate problem element, the visit must address one or more chronic illnesses with exacerbation, progression or treatment side effects, or two or more stable chronic illnesses. Adjusting medication for a worsening chronic condition therefore meets the moderate level on two elements. Prescribers commonly report 99213 for a stable patient on one medication with no changes.

When you code by time, the 2026 CMS descriptors set these minimums: 10 minutes for 99212, 20 for 99213, 30 for 99214 and 40 for 99215.

Adding psychotherapy with 90833

Use 90833 for psychotherapy provided during the same visit as an E/M service. Medicare’s billing article specifies 16 to 37 minutes of psychotherapy for 90833, 38 to 52 for 90836, and 53 or more for 90838.8 Count psychotherapy time separately from E/M time. The notes should identify the two services separately and include start and stop times or total psychotherapy time. Prolonged services codes cannot be billed with these add-ons.

Psychotherapy minutes cannot also count toward E/M time. For that reason, billing guides advise choosing the E/M level by MDM when adding 90833.

Codes for other prescribers

A few medication services have codes of their own:

90863 is an add-on created for prescribing psychologists in New Mexico and Louisiana, and the APA says psychiatrists and other medical providers shouldn’t use it.⁷

H2010, “Comprehensive medication services, per 15 minutes”, is a HCPCS Level II code that CMS marks not payable by Medicare. Medicaid coverage varies by state.⁹

99605, 99606 and 99607 are pharmacist-only medication therapy management codes, in 15-minute units.

How much does Medicare pay for medication visit codes in 2026?

Medicare’s 2026 national rates for codes used around a medication visit range from $5.01 for 96127 to $202.08 for 90792. The common combination of 99214 and 90833 totals $217.11. These figures come from the RVU26D file CMS released on August 26, 2026. Each rate is calculated by multiplying the code’s RVUs by the non-QPP conversion factor of $33.4009, with every geographic index set to 1.0.5 Clinicians in a qualifying APM use a conversion factor of $33.5675. That raises each rate slightly, including 90833 to $81.90.

The table above lists the office E/M and 90833 rates. Here are the other codes you may encounter at medication visits:

For a nurse practitioner billing under their own NPI, payment is based on 85% of the physician amount. The same 99214 and 90833 combination therefore totals $184.54. Medicare pays 80% of that amount or the actual charge, whichever is lower. The nurse practitioner must accept assignment.²

Codes Medicare doesn’t pay

Several medication codes have no Medicare payment in 2026. Codes 90863, 99417, H2010 and H0034 have status I: they are not valid for Medicare, which uses another code for the service. The pharmacist codes 99605 to 99607 have status X, a statutory exclusion. Code 90862 is absent from the file.¹ For prolonged office time, Medicare pays G2212 in place of 99417.

Medicaid policies that deny the add-on

Two CareSource Medicaid policies deny psychotherapy add-ons billed with higher E/M levels. CareSource Ohio’s notice, dated July 17, 2026, took effect September 1, 2026. It denies 90833, 90836 or 90838 when billed with 99204, 99205, 99214 or 99215 for the same member, date of service and provider TIN. Only the E/M is paid.¹⁰ CareSource’s Nevada Medicaid policy NV MCD-PY-1775 has applied the same rule since June 1, 2026. It also prohibits choosing the E/M level by time when one of these add-ons is billed.¹¹

Medicare has no such pairing denial. A 99214 and 90833 combination that Medicare pays as two codes is paid as 99214 alone under these two CareSource policies. Check the specific Medicaid plan’s add-on policy before billing both codes.

Telehealth medication management: POS and modifiers

The Consolidated Appropriations Act, 2021 permanently removed geographic and place-of-service restrictions for Medicare behavioral health telehealth, and audio-only visits are allowed for it.¹²

CMS directs practitioners to use POS 10 when the patient is at home, which pays the non-facility rate, and POS 02 when the patient is elsewhere.¹² Its claims manual says POS 02 or 10 must be paired with modifier 95 for audio-video visits or 93 for audio-only visits. The modifier does not change the rate.¹³ The December 2025 CMS telehealth booklet lists only POS codes for professional claims and limits the GT modifier to critical access hospitals billing under optional payment Method II.¹⁴ Ask your Medicare Administrative Contractor whether it requires modifier 95 on 2026 claims. Check each commercial payer’s policy as well.

Medication management coding examples

Established patient, dose change and psychotherapy. A patient with recurrent moderate depression reports worsening symptoms. You adjust the antidepressant and provide 20 minutes of psychotherapy, timed separately. List F33.1 first and Z79.899 as an additional diagnosis code. Bill 99214 based on MDM: a chronic illness with exacerbation, plus prescription drug management. Add 90833 for the 20 minutes of psychotherapy. For a video visit with the patient at home, add POS 10.

Drug level check. A patient with bipolar disorder in full remission, most recent episode depressed, comes in for a lab-based drug level check. Z51.81 explains the encounter and is generally listed first as an aftercare code. Follow it with F31.76 and Z79.899. The tabular list instructs you to code Z79.899 with Z51.81.

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Medication management on your bill: a note for patients

If you see “medication management” on your bill, it usually means your prescriber billed an E/M visit, such as 99214. The claim may describe it as “Office o/p est mod 30 min”. That label can be confusing: 30 minutes is one way to choose the level, but a shorter visit can still qualify as 99214 based on decision making. A separate line labeled “Psytx w pt w e/m 30 min” represents 90833. It requires more than 15 minutes of psychotherapy, separate from the medication discussion.

If a short check-in includes both codes, start by asking your prescriber’s office for an itemized bill. Then ask your insurer what it pays for each code. Talkiatry, an online psychiatry practice, advises patients to check visit costs this way, asking about 99204 for the first visit and 90833. If you pay out of pocket, a superbill lists the CPT and diagnosis codes needed to request reimbursement.

How SimplePractice handles diagnosis and service codes

SimplePractice is a practice management system with insurance billing on every plan. When you add a diagnosis on the client’s Overview page, it carries forward to later appointments. To include several diagnosis codes on claims and superbills, select “Include multiple Diagnosis Codes” in settings. Each appointment needs a service code. Add-on codes attach to a primary code, and each service code supports up to four modifiers.

Plans cost $49, $79 or $99 a month, plus a $20 annual fee per clinician for AMA CPT codes. Starting October 1, 2026, electronic claims cost $0.39 each for the first 250 a month. The 30-day free trial requires no credit card. For more on the platform, see our SimplePractice review. Our guide to insurance credentialing for therapists explains how to get in-network before billing.

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