Summary & Overview
HCPCS G9918: Functional Status Not Performed, Reason NOS
HCPCS Level II code G9918 designates that a planned functional status assessment was not performed and no other specific reason code applies. Nationally, accurate capture of non-performance reasons affects quality measurement, claims processing, and administrative tracking across settings where functional assessments are expected, such as outpatient clinics, home health, and institutional care.
This publication examines coverage and treatment by major payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of how G9918 is used in billing workflows, common modifiers that appear with non-performance claims, and the clinical contexts in which the code typically appears. The report also outlines benchmarks where available and summarizes relevant policy updates that influence documentation and claim acceptance for non-performed functional assessments.
The analysis is intended for billing managers, compliance officers, and clinicians who need clarity on coding for missed or uncompleted functional status evaluations. It provides practical context on claim documentation expectations, common payer considerations, and the potential impact on quality reporting when functional status data are absent.
Billing Code Overview
HCPCS Level II code G9918 denotes Functional status not performed, reason not otherwise specified. This code indicates that a planned assessment of a patient's functional status was not completed and no more specific reason code applies.
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Service type: Functional status assessment (not performed)
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Typical site of service: Any clinical setting where functional status assessments are expected, including outpatient clinics, home health visits, and institutional care settings
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Clinical & Coding Specifications
Clinical Context
A patient scheduled for a functional status assessment (mobility, ADLs, or instrumental ADLs) during an outpatient rehabilitation visit is unable to complete the standardized evaluation. For example, a 78-year-old patient with advanced dementia and recent hip fracture presents for a physical therapy visit. The therapist attempts the standardized functional status test (e.g., Timed Up and Go, Barthel Index) but the patient is non-ambulatory, uncooperative, or has acute medical instability that prevents performance. The clinician documents the reason for non-performance (behavioral refusal, medically unstable vital signs, acute pain, or safety concerns). Billing uses G9918 to indicate the functional status assessment was not performed with reason not otherwise specified. Typical workflow includes documentation of attempted testing, the specific barrier to testing, alternative assessments or plan (e.g., deferred testing, caregiver report), and application of an appropriate modifier when required by payer rules. Typical site of service is outpatient rehabilitation clinics, skilled nursing facilities, or home health visits where functional status is routinely assessed but cannot be completed.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | When substantially greater work than typical was performed related to the visit though the functional test was not completed (rare for ). |