Summary & Overview
HCPCS G8779: Diabetes Screening Test Not Performed, Reason Not Given
HCPCS Level II code G8779 documents that a diabetes screening test was not performed and no reason was given. As a preventive care indicator, this code signals a missed opportunity for early detection and management of diabetes, carrying implications for quality measurement and administrative reporting at a national level. Tracking instances of G8779 can inform population health initiatives and payers’ preventive care performance assessments.
This analysis covers major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code's clinical context, typical settings where the code appears, and what its use signifies for reporting and quality metrics. The publication also outlines benchmarks and payer coverage patterns where available, relevant policy updates affecting preventive screening documentation, and guidance on interpreting G8779 in claims data.
Intended for clinicians, billing professionals, and policy analysts, the content clarifies how G8779 is used in practice, why consistent documentation matters for population health and quality measurement, and where to look for further coding and policy details. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code G8779 indicates a diabetes screening test not performed, reason not given. This code documents that a recommended diabetes screening was not completed for the patient, without an explicit reason recorded in the claim.
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Service type: Screening service for diabetes risk or diagnosis
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Typical site of service: Outpatient or ambulatory care settings where preventive screenings are performed, such as primary care clinics, community health centers, and outpatient offices
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is a 45-year-old adult scheduled for an annual wellness or preventive visit at a primary care clinic. The provider intends to perform diabetes screening (for example fasting plasma glucose, HbA1c, or oral glucose tolerance testing) because of risk factors such as obesity, family history of diabetes, or hypertension. At the time of the visit the clinician documents that the diabetes screening test was not performed, but fails to record the reason for nonperformance (for example the patient declined, specimen not obtained, or laboratory unavailable). The clinical workflow includes: pre-visit risk assessment, ordering the appropriate laboratory test (HbA1c or fasting glucose), attempt to obtain the specimen either onsite or by directing the patient to a reference laboratory, and documenting test results in the electronic health record. When the ordered diabetes screening is not completed and no reason is documented in the chart, the encounter may be billed with HCPCS Level II code G8779 to indicate the diabetes screening test was not performed, reason not given. Typical site of service is an ambulatory primary care clinic, outpatient family medicine or internal medicine practice, or community health center where preventive screening is routinely offered.
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 or other service | Use when the E/M visit is distinct from the diabetes screening order and documentation supports a separate E/M service on the same day as G8779 reporting |
59 | Distinct procedural service | Use when another distinct procedure or service is performed the same day and documentation supports separation from the diabetes screening order |
24 | Unrelated E/M service by the same physician during a postoperative period | Use if the diabetes screening order was placed during a postoperative period and the E/M is unrelated to the surgery |
52 | Reduced services | Use when the ordered diabetes screening was partially performed but not completed and a reduced service modifier is appropriate per payer rules |
76 | Repeat procedure or service by same physician | Use if the diabetes screening was previously attempted same day and repeated attempts were made but not completed without documented reason |
77 | Repeat procedure by another physician | Use if another provider repeats an attempt to obtain the screening but final testing was not completed and reason not documented |
90 | Reference (outside) laboratory | Use when the specimen was sent to an outside laboratory; pair with G8779 if the test was not completed and lab involvement is relevant to billing |
QW | CLIA waived test performed in a waived setting | Use when a CLIA-waived point-of-care diabetes screening test was intended but not performed and the reason is not given (payer-specific applicability) |
XE | Separate encounter, distinct from other services (Modifier X, HCPCS Level II) | Use to indicate the service tied to the diabetes screening (order) was from a separate encounter when relevant to bundling rules |
XP | Separate practitioner, distinct from other services (Modifier X, HCPCS Level II) | Use when a different practitioner was responsible for ordering or attempting the screening |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207Q00000X | Family Medicine | Most common primary care specialty ordering routine diabetes screening |
207R00000X | Internal Medicine | Primary care internists frequently order diabetes screening during preventive visits |
208D00000X | General Pediatrics | Pediatricians order diabetes screening for adolescents with risk factors |
207K00000X | Obstetrics & Gynecology | OB/GYNs perform screening during prenatal care or preventive visits for adult women |
174400000X | Nurse Practitioner | Advanced practice clinicians in ambulatory settings who order and follow up diabetes screening |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
Z13.1 | Encounter for screening for diabetes mellitus | Directly indicates an encounter for diabetes screening; commonly associated with orders for 83036 or 82947 and relevant when G8779 documents nonperformance |
E66.9 | Obesity, unspecified | Obesity is a major risk factor prompting diabetes screening; often present on the problem list when screening is ordered |
I10 | Essential (primary) hypertension | Hypertension increases cardiovascular risk and is a common comorbidity prompting diabetes screening |
E11.9 | Type 2 diabetes mellitus without complications | May appear when screening occurs for monitoring; if present, screening may be diagnostic or monitoring rather than purely preventive |
Z00.00 | Encounter for general adult medical examination without abnormal findings | Preventive visit code often used when screening tests are ordered; relevant to workflows where G8779 may be reported if screening not completed |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
82947 | Glucose; quantitative, blood (e.g., glucose monitoring for screening) | Common laboratory test ordered for diabetes screening; would be billed when the test is performed instead of reporting G8779 |
83036 | Hemoglobin; glycosylated (A1c) | Standard screening/diagnostic test for diabetes and prediabetes; performed when screening is completed |
82950 | Glucose; tolerance test (GTT), including glucose (when performed) | Used when an oral glucose tolerance test is ordered as part of diabetes evaluation; billed when completed |
81002 | Urinalysis, by dipstick or tablet reagent; non-automated, without microscopy | Sometimes used as adjunctive screening for glycosuria in point-of-care settings; billed when performed |
99401 | Preventive medicine counseling, individual; approximately 15 minutes (historical example) | Preventive counseling codes are commonly reported during visits when screening is ordered; counseling may occur even if screening is not completed |
99000 | Handling and/or conveyance of specimen for transfer from the office to a laboratory (if performed) | Billed when specimen handling occurs; not applicable when screening was not performed and reason not documented |