Summary & Overview

HCPCS G9928: FDA-Approved Anticoagulant Not Prescribed, Reason Not Given

HCPCS Level II code G9928 captures instances where an FDA-approved anticoagulant was indicated but was not prescribed and no reason for omission was recorded. Nationally, such documentation codes matter for quality measurement, medication safety monitoring, and payer adjudication when anticoagulation is a guideline-recommended therapy. Clear use of G9928 can affect quality reporting and review processes tied to anticoagulation management across settings.

This analysis covers major national payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code’s clinical context, typical service settings, and what to expect in billing scenarios. The publication outlines benchmarks and common billing practices where available, highlights policy considerations around documentation of omitted therapies, and summarizes clinical implications for anticoagulation management.

The content is intended for administrators, billing professionals, and policy analysts seeking a national-level overview of G9928. Data not available in the input is noted where applicable; the piece emphasizes documentation purpose, payer relevance, and areas where organizations often focus audit and quality workflows.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG9928HCPCS Level IIanticoagulationmedication managementquality measureclinical documentationambulatory careinpatient care

Billing Code Overview

HCPCS Level II code G9928 indicates that a FDA-approved anticoagulant was not prescribed, with no reason provided. The entry documents the absence of a prescription for an indicated anticoagulant therapy.

Service type: Medication management / medication omission documentation
Typical site of service: Ambulatory care or inpatient clinical encounter where anticoagulation prescribing would be expected

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult recently discharged from hospital after diagnosis of non-valvular atrial fibrillation or venous thromboembolism for which an FDA‑approved anticoagulant (direct oral anticoagulant or warfarin) was clinically indicated but was not prescribed. The patient presents to the ambulatory clinic or hospital discharge team for medication reconciliation and follow‑up. The clinician documents that an anticoagulant was considered, the indication met prescribing criteria, but no anticoagulant was prescribed and no specific reason is recorded in the chart. Common workflow steps include review of admitting and discharge summaries, medication reconciliation, assessment of bleeding risk and renal function, and documentation of plan. This code is used to indicate the absence of an expected FDA‑approved anticoagulant prescription without a documented reason, and typically accompanies care coordination, safety review, or a quality audit encounter rather than a procedure performed on the patient. Typical sites of service are inpatient acute care wards, observation units, and outpatient clinic visits where discharge medications are reviewed.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when services required substantially greater work than typical for the visit or encounter documenting the omission.
`23`	Unusual anesthesia	Rarely applicable; use only if anesthesia was used under unusual circumstances during an encounter tied to medication reconciliation.
`52`	Reduced services	Use when the encounter was partially completed or services were reduced relative to the typical encounter.
`53`	Discontinued procedure	Use when the planned encounter or procedure was started but discontinued for clinical reasons related to anticoagulation assessment.
`54`	Surgical care only	Use when billing only the surgical portion of care and the anticoagulant omission is documented in perioperative medication reconciliation.
`55`	Postoperative management only	Use when billing only postoperative care and anticoagulant omission is documented during that period.
`56`	Preoperative management only	Use when billing only preoperative care and omission is identified in preop medication planning.
`62`	Two surgeons	Use when two surgeons participate and documentation of anticoagulant omission impacts perioperative management.
`AS`	Non‑covered ambulatory surgical center service	Use when service is subject to ambulatory surgery center coverage limitations relevant to the encounter.
`CO`	Temporary state‑mandated COVID‑19 policy	Use when payer applies COVID‑19 related billing condition affecting reporting of the encounter.

Taxonomy Code	Specialty	Notes
`207R00000X`	Internal Medicine	Primary providers managing anticoagulation decisions in inpatient and outpatient settings.
`207L00000X`	Cardiology	Specialists prescribing anticoagulation for atrial fibrillation or thromboembolic disease.
`207K00000X`	Family Medicine	Outpatient clinicians performing medication reconciliation and follow‑up after discharge.
`341600000X`	Hospitalist	Inpatient physicians responsible for discharge medication reconciliation and documentation.
`363A00000X`	Clinical Pharmacist	Pharmacists involved in medication reconciliation and anticoagulation management programs.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I48.0`	Paroxysmal atrial fibrillation	Atrial fibrillation commonly requires anticoagulation; omission of an anticoagulant when indicated is directly relevant.
`I48.1`	Persistent atrial fibrillation	Indicates a sustained arrhythmia with stroke risk where anticoagulation is generally indicated.
`I26.9`	Pulmonary embolism, unspecified	Venous thromboembolism diagnosis that typically requires anticoagulation; omission is clinically significant.
`I82.40`	Acute embolism and thrombosis of unspecified deep veins of lower extremity	Deep vein thrombosis commonly mandates anticoagulant therapy; documentation of omission is relevant to safety reviews.
`Z79.01`	Long term (current) use of anticoagulants	Used when anticoagulation therapy is chronic; absence where expected may warrant audit and reconciliation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99221`	Initial hospital care, typically 30 minutes at bedside and on the patient's hospital floor	Used for initial inpatient evaluation where anticoagulation indication is assessed and omission may be documented.
`99238`	Hospital discharge day management; 30 minutes	Used when discharge medication reconciliation occurs and omission of an anticoagulant is recorded at discharge.
`99213`	Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes	Used for outpatient follow‑up visits reviewing anticoagulation needs and documenting that no anticoagulant was prescribed.
`99406`	Smoking and tobacco use cessation counseling, intermediate, greater than 3 minutes up to 10 minutes	Ancillary counseling code that may be billed during follow‑up visits addressing modifiable thrombotic risk factors in the same encounter.
`99606`	Medication therapy management service(s) provided by pharmacist, face-to-face, per 15 minutes	Used when a clinical pharmacist provides medication reconciliation and documents the absence of an anticoagulant prescription.