Summary & Overview
HCPCS Level II C9037: Injection, risperidone (Perseris), 0.5 mg
HCPCS Level II code C9037 denotes an injection of risperidone (Perseris) at a 0.5 mg unit. As a drug-specific HCPCS Level II code, it is used to bill the medication component of long-acting injectable antipsychotic therapy. This code matters nationally because long-acting injectables are central to outpatient management of certain psychiatric disorders and can affect medication access, adherence, and payer coverage policies across commercial and public payers.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for C9037, typical sites of service where the product is administered, and which payers commonly process claims for the drug component. The publication also outlines expected benchmarks and coverage considerations, summarizes recent policy developments affecting HCPCS drug coding and reimbursement, and highlights billing and documentation elements relevant to the medication-only claim line. Data not available in the input for modifiers, associated taxonomies, ICD-10 diagnoses, related codes, and service line are noted as unavailable.
Billing Code Overview
HCPCS Level II code C9037 represents an injection of risperidone (Perseris) in a dosage unit of 0.5 mg. The code describes the drug product administered via injection and is used to report the medication component of the service.
Service type: Long-acting injectable antipsychotic medication administration (drug only)
Typical site of service: Outpatient clinic or behavioral health clinic
Data not available in the input for modifiers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with schizophrenia or schizoaffective disorder receiving long-acting injectable risperidone (Perseris) for maintenance therapy. The patient presents to an outpatient behavioral health clinic or psychiatric infusion center for a scheduled monthly subcutaneous injection of risperidone. Prior to administration, a licensed clinician (psychiatrist, psychiatric nurse practitioner, or registered nurse) verifies identity, reviews current psychiatric status, medication adherence, recent side effects (extrapyramidal symptoms, metabolic changes), and obtains informed consent for the injection. The clinician inspects the injection site, prepares the pre-filled syringe, and administers the subcutaneous injection into the upper outer quadrant of the buttock or abdomen per product instructions. Post‑administration monitoring for 15–30 minutes occurs to observe for immediate adverse reactions (e.g., allergic reaction, injection site reaction, acute dystonia), and documentation includes lot number, dose in mg, site, date/time, and clinician credentials. Billing uses the HCPCS Level II code C9037 to report the administered dose equivalent (0.5 mg units as specified) and may be accompanied by appropriate facility or professional visit codes in the global encounter.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure | Use when a distinct psychiatric E/M is provided and documented the same day as the injection |
59 | Distinct procedural service | Use when another procedural code is performed the same day and is not typically reported together
76 | Repeat procedure by same physician | Use when the injection administration is repeated by the same clinician later the same day
77 | Repeat procedure by another physician | Use when another clinician repeats the injection procedure the same day
RT | Right side | Use when documenting laterality for injection site on the right side
LT | Left side | Use when documenting laterality for injection site on the left side
QS | Monitored anesthesia care service (drug/substance) | Rarely used; only if sedation/monitoring drugs administered and reported per payer guidance
XE | Separate encounter, a different encounter, or service | Use under NCCI-associated modifier rules when services are separate
XP | Separate practitioner | Use when a different practitioner performs a distinct portion of services
AA | Anesthesia services performed personally by anesthesiologist | Not commonly applicable; included for completeness when anesthesia is used
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207P00000X | Psychiatry & Neurology (Adult Psychiatry) | Psychiatrists prescribing and overseeing long‑acting injectable antipsychotics |
2084P0800X | Nurse Practitioner (Psychiatric/Mental Health) | NP providers who may evaluate and order/oversee injections
364A00000X | Registered Nurse | RNs who perform administration of injections per state scope and facility policy
261QP2300X | Clinical Nurse Specialist (Psychiatric) | CNS involved in medication management programs
208000000X | Physician Assistant | PAs who may administer or supervise medication administration
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
F20.9 | Schizophrenia, unspecified | Primary indication for long-acting injectable risperidone in maintenance therapy |
F25.0 | Schizoaffective disorder, bipolar type | Indication for antipsychotic long-acting injectable therapy for mood and psychotic symptom control
F25.9 | Schizoaffective disorder, unspecified | Used when schizoaffective features require maintenance antipsychotic treatment
F23.9 | Brief psychotic disorder, unspecified | May be used transiently in early phases before long-term medication plan is established
F32.9 | Major depressive disorder, single episode, unspecified | Occasionally co‑managed with antipsychotics in augmentation strategies for severe mood disorders
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
99213 | Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes | Commonly billed when a routine psychiatric follow‑up visit coincides with medication administration |
96372 | Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); intramuscular or subcutaneous | Sometimes reported for administration services when payers require a CPT administration code in addition to medication HCPCS
96361 | Intravenous infusion, hydration; initial, 31 minutes to 60 minutes | Not typically used for subcutaneous antipsychotic injections; included for clinical workflows where infusion services occur concurrently
90471 | Immunization administration (includes percutaneous, intradermal, subcutaneous, or intramuscular injections) | Occasionally used by some clinics for reporting administration technique when required by payer rules
99354 | Prolonged service in the office or other outpatient setting (direct patient contact), first hour | Used rarely when extended monitoring or complex counseling is provided at the visit containing the injection