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    v1.0.28
    OpenPayerBilling CodesTherapeutic Drug AssaysCPT cpt-80338-antidepressant-detection-assay
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    CPT 80338: Antidepressant Drug Testing, Qualitative or Quantitative

    CPT code 80338 describes laboratory testing where the analyst measures or detects the presence of antidepressant medications in a patient specimen; the service is a clinical laboratory drug assay and is typically performed in a clinical laboratory or hospital laboratory setting for medication monitoring, compliance, or toxicology assessment.

    For related coverage guidance, see recent payer policy updates: Epithelial Cell Cytology in Breast Cancer Risk Assessment, Chemotherapy Observation or Inpatient Hospitalization (for New Mexico Only), Umbilical Cord Blood Harvesting and Storage for Future Use (for Indiana Only).

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 35-year-old patient treated for major depressive disorder presents for a routine medication monitoring visit after a change in antidepressant therapy. The clinician orders a urine or serum toxicology assay to measure presence and/or concentration of antidepressant medications to confirm adherence, evaluate possible drug interactions, or assess suspected toxicity. The specimen is collected in an outpatient laboratory or hospital phlebotomy area and sent to the clinical chemistry/toxicology lab. The laboratory analyst performs qualitative or quantitative testing using immunoassay screening followed by confirmatory methods (eg, GC-MS or LC-MS/MS) if needed. Results are reported to the ordering psychiatrist or primary care provider, who documents interpretation in the medical record and adjusts therapy as clinically indicated. Typical sites of service include outpatient hospital laboratories, independent clinical laboratories, and ambulatory clinic laboratories.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    80307Drug screen, presumptive, any number of drug classes; non-automated, per date of serviceCommonly used as an initial immunoassay screen for multiple drug classes prior to specific antidepressant testing
    80305Drug screen, presumptive, any number of drug classes; presumptive, by instrumented method, qualitativeInstrumented presumptive drug testing often performed before or alongside antidepressant-specific assays
    80339Antidepressant assay, specific drug, quantitativeUsed when quantitative measurement of a specific antidepressant is required; complements 80338 when the specific agent is identified
    82570Drug assay, amphetamine and metabolites; qualitativeOther toxicology assays commonly performed in psychiatric patients to evaluate co-occurring substance use alongside antidepressant testing
    82542Drug assay, benzodiazepine; definitive, quantitativeDefinitive confirmatory testing for sedative-hypnotics that may interact with antidepressants; often performed in the same toxicology panel
    81003Urinalysis, automated, non-microscopic; with reflex microscopic examSpecimen evaluation performed concurrently to assess urine integrity and potential contamination for urine-based antidepressant testing

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    90Modifier ‑90 (Reference/Outside Laboratory) indicates that a laboratory test was performed by an entity other than the treating or reporting provider. The American Medical Association defines…- Use CPT modifier -90 when a laboratory test is performed by an outside/reference laboratory (an entity other than the treating or reporting physician or qualified professional) and the claim needs…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    2084P0800XPsychiatry PhysicianA Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, …
    208D00000XGeneral Practice PhysicianA physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    208000000XPediatrics PhysicianA pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectru…
    163WM0705XMedical-Surgical Registered NurseNursing Service Providers · Registered Nurse
    261QR1300XRural Health Clinic/CenterAmbulatory Health Care Facilities · Clinic/Center
    2251C2600XCardiopulmonary Physical TherapistA licensed physical therapist, including but not limited to an individual who is a Board Certified Specialist in Cardiovascular & Pulmonary Physical T…
    3747A0650XAttendant Care ProviderAn individual who provides hands-on care, of both a supportive and health related nature, specific to the needs of a medically stable, physically hand…

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    F06.31Mood disorder due to known physiological condition with depressive features
    F11.20Opioid dependence, uncomplicated
    F12.20Cannabis dependence, uncomplicated
    F19.20Other psychoactive substance dependence, uncomplicated
    F31.4Bipolar disorder, current episode depressed, severe, without psychotic features
    F31.5Bipolar disorder, current episode depressed, severe, with psychotic features
    F32.0Major depressive disorder, single episode, mild
    F32.1Major depressive disorder, single episode, moderate
    F32.2Major depressive disorder, single episode, severe without psychotic features
    F32.3Major depressive disorder, single episode, severe with psychotic features

    Showing 1–10 of 26

    Related Payer Policy Updates

    Specialty: Hematology/Oncology1 / 2

    10 rows

    PolicyPayerEffective Date
    Epithelial Cell Cytology in Breast Cancer Risk AssessmentOscar Health2026-10-01
    Chemotherapy Observation or Inpatient Hospitalization (for New Mexico Only)UnitedHealthcare2026-08-01
    Umbilical Cord Blood Harvesting and Storage for Future Use (for Indiana Only)UnitedHealthcare2026-08-01
    Antibody-Drug ConjugatesPremera Bluecross2026-08-01
    Chimeric Antigen Receptor (CAR) T-Cell TherapyColorado Rocky Mountain Health Plans2026-08-01
    Allogeneic Hematopoietic Progenitor Cell TherapyAmbetter Georgia2026-08-01
    Umbilical Cord Blood Harvesting and Storage for Future Use (for Idaho Only)UnitedHealthcare2026-08-01
    Umbilical Cord Blood Harvesting and Storage for Future Use (for New Jersey Only)UnitedHealthcare2026-08-01
    Umbilical Cord Blood Harvesting and Storage for Future Use (for Ohio Only)UnitedHealthcare2026-08-01
    Reblozyl (luspatercept-aamt) Medical Benefit Drug PolicyUnitedHealthcare2026-08-01

    Related Codes

    CPT-80143-ACETAMINOPHEN-QUANTITATIVE-SERUM-ASSAY

    CPT 80143: Acetaminophen Quantitative Assay

    CPT-80145-ADALIMUMAB-LEVEL-ASSAY-THERAPEUTIC-DRUG-MONITORING

    CPT 80145: Adalimumab Quantitative Drug Level Assay

    CPT-80150-AMIKACIN-QUANTITATIVE-ASSAY-THERAPEUTIC-DRUG-MONITORING

    CPT 80150: Amikacin Quantitative Serum Level

    CPT-80151-AMIODARONE-QUANTITATIVE-SERUM-ASSAY

    CPT 80151: Amiodarone Quantitative Drug Level Assay

    CPT-80155-CAFFEINE-LEVEL-TESTING

    CPT 80155: Caffeine Level Quantification

    CPT-80156-CARBAMAZEPINE-TOTAL-LEVEL-LAB-ASSAY

    CPT 80156: Carbamazepine Total Level (Serum)

    CPT-80157-FREE-CARBAMAZEPINE-ASSAY

    CPT 80157: Free Carbamazepine Quantitative Assay

    CPT-80158-CYCLOSPORINE-QUANTITATIVE-ASSAY-LAB

    CPT 80158: Cyclosporine Quantitation, Laboratory

    CPT-80159-CLOZAPINE-LEVEL-ASSAY-THERAPEUTIC-DRUG-MONITORING

    CPT 80159: Clozapine Level Measurement

    CPT-80161-CARBAMAZEPINE-EPOXIDE-QUANTITATIVE-ASSAY

    CPT 80161: Carbamazepine 10,11-Epoxide Level, Quantitative

    Showing 1–10 of 87

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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