Summary & Overview
HCPCS M1138: Short-Term Consultation or Referral, 1-2 Visits
HCPCS Level II code M1138 designates short-term encounters where ongoing care is not indicated and the patient is seen for only one or two visits (for example, a home program only, referral to another provider, or consultation only). Nationally, this code matters because it clarifies billing for limited, consultative services that stop short of ongoing therapy, affecting provider documentation, claims adjudication, and resource allocation for brief-care episodes. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical intent behind the code, typical service settings, common modifiers associated with billing for limited visits, and where to look for payer-specific policies. The summary provides benchmarks and policy context where available; if specific payer coverage or taxonomy mappings are not provided here, those data points are noted as not available in the input. This publication aims to give clinicians, billing staff, and policy analysts a concise reference to understand when M1138 is appropriate and what documentation expectations and payer considerations typically accompany limited, single- or two-visit episodes of care.
Billing Code Overview
HCPCS Level II code M1138 indicates ongoing care not indicated, patient seen only 1-2 visits. This code is used when services consist of a very limited episode of care such as a single consultation, initiation of a home program with minimal follow-up, or referral to another provider or facility. The description specifies that continuing therapy or repeated visits are not intended beyond the initial one or two encounters.
Service Type: Short-term consultation or one-time therapeutic encounter
Typical Site of Service: Outpatient clinic, home health setting, or other ambulatory site where brief evaluation and instruction or referral take place
Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and detailed payer-specific rules.
Clinical & Coding Specifications
Clinical Context
A typical patient scenario involves a patient referred for a single consultation visit with a physical therapist, occupational therapist, home health clinician, or outpatient rehabilitation provider where ongoing therapy is not indicated. Example: an adult with a new low-risk ankle sprain is evaluated in an outpatient physical therapy clinic for education, a one-visit home exercise program, and a recommendation to follow up with primary care if symptoms worsen. The clinician documents a focused evaluation, provides instruction for a home program, issues durable medical equipment instructions (if needed), and documents that ongoing skilled therapy is not medically necessary at this time. The visit may occur in a clinic, physician office, or the patient’s home. The visit is limited to one or two visits, may result in a referral to another provider or facility, and is billed when only short-term consultative services or a home program are provided and continued skilled care is not indicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typically required for the service and documentation supports significantly more work. |
23 | Unusual anesthesia |