Summary & Overview
HCPCS M1297: BMI Not Documented Due to Medical Reason or Patient Refusal
HCPCS Level II code M1297 documents that BMI was not recorded because of a medical contraindication or patient refusal of height or weight measurement. As a clinical documentation code, it clarifies why a routinely captured vital sign was omitted and supports accurate encounter records and quality reporting. Nationally, consistent use of M1297 helps standardize reporting around BMI capture gaps and can affect quality measure denominators and chart completeness assessments.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication describes how payers commonly treat documentation exceptions, what clinical contexts typically justify omission (for example, acute instability or patient refusal), and where this code appears in service lines for outpatient or ambulatory settings.
Readers will find benchmarks and typical usage patterns, a review of policy implications for quality measurement and claims processing, and clinical context for appropriate documentation. The analysis also identifies common modifiers and coding practices used alongside M1297, and highlights operational considerations for front-line clinical and coding staff. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code M1297 indicates BMI not documented due to medical reason or patient refusal of height or weight measurement. The code denotes that body mass index (BMI) was not recorded during the encounter because of a documented medical reason (for example, an acute condition preventing safe measurement) or because the patient refused measurement of height or weight.
Service type: Clinical documentation exception for preventive or evaluative encounters where BMI would normally be recorded
Typical site of service: Outpatient clinic or ambulatory care settings where routine vitals and anthropometric measurements are collected
Clinical & Coding Specifications
Clinical Context
A patient presents to an outpatient primary care clinic or specialty office for routine evaluation. The clinician documents that body mass index (BMI) measurement is not recorded because obtaining height or weight was medically contraindicated (for example, unstable spine injury, immobilized patient, or recent surgery) or the patient refused height or weight measurement. The encounter includes history, examination of other systems, counseling, or management unrelated to vital signs. Clinic staff attempt standard vital sign collection but document the specific reason for omission and use billing code M1297 to indicate BMI was not documented due to medical reason or patient refusal. Typical workflow: triage staff attempt vitals → inability or refusal to measure height/weight documented in the medical record with clinical justification → clinician documents assessment/plan and orders as appropriate → coder applies M1297 on the claim when BMI is not recorded and an explanatory note is present in the chart. Typical sites of service are outpatient office visits, urgent care clinics, and some outpatient rehabilitation or home health visits where measurement is impractical or unsafe. Common patient scenarios include an elderly patient with recent hip fracture who cannot be safely weighed, a patient with severe pain or limited mobility refusing standing for height/weight, or an acute infectious patient who declines close contact for measurement.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|