HCPCS G9799: Medication Dispensing Indicator for History of Asthma - OpenPayer

Summary & Overview

HCPCS G9799: Medication Dispensing Indicator for History of Asthma

HCPCS Level II code G9799 identifies patients with a medication dispensing event indicator that documents a history of asthma at any point through the end of a measurement period. This administrative marker is used in quality measurement and medication-dispensing datasets to flag patients with past asthma for care coordination, population health reporting, and measure stratification. Nationally, consistent use of this code supports accurate denominators for asthma-related quality measures and helps ensure patients with historical asthma are captured in medication safety and adherence analyses.

Key payers addressed in this review include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise description of the code's clinical and administrative purpose, the typical service setting where the code is recorded, and the types of analyses and benchmarks for which this indicator is relevant.

This publication also outlines common modifiers and notes when data are not provided in the source input. The content is aimed at clinicians, coding professionals, health plan analysts, and quality measurement teams seeking a clear understanding of HCPCS Level II code G9799, its role in medication dispensing records, and its implications for national measurement and reporting efforts.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG9799HCPCS Level IImedication dispensingasthma historyquality measurementambulatory carepharmacypopulation health

Billing Code Overview

HCPCS Level II code G9799 denotes patients with a medication dispensing event indicator of a history of asthma at any time during the patient's history through the end of the measure period. This code is used to identify patients whose records contain an indicator that they have experienced asthma historically, and it is applied to patient-level medication dispensing datasets or measure reporting that track asthma history over time.

Service Type: Medication dispensing / medication history capture

Typical Site of Service: Pharmacy, outpatient clinics, and other ambulatory care settings where medication dispensing events are recorded

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 34-year-old female presents to a primary care clinic for routine chronic disease management and medication reconciliation. She has a documented history of asthma with intermittent controller therapy in prior years but no current active dispensing within the reporting period. During the visit the clinician reviews the patient’s medication history in the electronic health record and the statewide prescription monitoring system, documents a lifetime history of asthma and a prior medication dispensing event, and records that history through the end of the measure period. The clinical workflow includes: patient intake and confirmation of problem list, medication history review by medical assistant, clinician verification of prior asthma medication dispensing, documentation of the medication-dispensing-event indicator in the chart, and coding/billing staff assignment of the appropriate HCPCS Level II code G9799 to indicate a history of asthma dispensing during the patient’s history through the end of the measure period.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased Procedural Services	Use when work required to document or reconcile complex medication history is substantially greater than typical for an office visit related to this code.

HCPCS G8851: Annual Assessment of Therapy Adherence

HCPCS-G9128-MULTIPLE-MYELOMA-DISEASE-STATUS-SMOLDERING-STAGE-I

HCPCS G9128: Multiple Myeloma Disease Status Assessment, Smoldering/Stage I

HCPCS-G2190-HEADACHE-RADIATING-TO-NECK-IMAGING

HCPCS G2190: Head Imaging for Headache Radiating to Neck

HCPCS-G8544-CABG-MEASURES-REPORTING

HCPCS G8544: Intent to Report CABG Measures Group

HCPCS-G0140-PRINCIPAL-ILLNESS-NAVIGATION-PEER-SUPPORT

HCPCS G0140: Principal Illness Navigation, Peer Support (60 min/month)

HCPCS-G0057-EMERGENCY-MEDICINE-SAFETY-BEST-PRACTICES

HCPCS G0057: Emergency Medicine Best Practices and Patient Safety

HCPCS-G8907-FACILITY-SAFETY-EVENT-ABSENCE-DOCUMENTATION

HCPCS G8907: Facility Documentation of No Specified Adverse Events

HCPCS-G2099-OLDER-PATIENTS-FRAILTY-ADVANCED-ILLNESS

HCPCS G2099: Patients 66+ with Frailty and Advanced Illness

HCPCS-G9109-HEAD-NECK-SQUAMOUS-CELL-DISEASE-STATUS-T1-T2-N0-M0

HCPCS G9109: Head and Neck Squamous Cell Disease-Status Assessment

HCPCS-G0337-HOSPICE-EVALUATION-COUNSELING-PRE-ELECTION

HCPCS G0337: Hospice Evaluation and Counseling, Pre-Election

Showing 1–10 of 1996

23

Taxonomy Code	Specialty	Notes
`208000000X`	Family Medicine	Primary care clinicians who document medication history and chronic disease management for asthma.
`207Q00000X`	Internal Medicine	Hospital-based and ambulatory internists who manage chronic asthma and document dispensing history.
`207L00000X`	Pulmonary Disease	Pulmonologists who evaluate asthma history and prior medication dispensing events.
`363LP0800X`	Pediatric Pulmonology	Specialists managing pediatric patients with asthma and documenting lifetime medication history.
`103T00000X`	Nurse Practitioner	Advanced practice providers who frequently perform medication reconciliation and document the dispensing-event indicator.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J45.909`	Unspecified asthma, uncomplicated	Represents a common asthma diagnosis associated with documentation of prior medication dispensing.
`J45.901`	Unspecified asthma, with (acute) exacerbation	Relevant when prior dispensing history informs management of an acute exacerbation.
`J45.40`	Moderate persistent asthma, uncomplicated	Chronic asthma severity code often linked to medication therapy history.
`Z87.01`	Personal history of respiratory conditions (asthma)	Used to indicate past history of asthma when current active treatment may not be ongoing but documentation of prior dispensing exists.
`R06.2`	Wheezing	Symptom code that may prompt review of prior asthma medication dispensing and documentation.
`Z79.82`	Long term (current) use of inhaled steroids	Indicates chronic controller therapy and is clinically relevant to medication dispensing history.
`J96.00`	Acute respiratory failure, unspecified whether with hypoxia or hypercapnia	Severe respiratory events that may be contextualized by prior asthma medication dispensing history.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99213`	Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes	Commonly billed for routine follow-up visits where medication history and asthma history documentation (`G9799`) occur.
`99406`	Smoking and tobacco use cessation counseling, intermediate, greater than 3 minutes up to 10 minutes	Often provided alongside asthma history review when counseling on smoking cessation is relevant to asthma control.
`99495`	Transitional care management services with moderate or high complexity medical decision making, within 14 days of discharge	May be billed when documenting medication history and coordinating care post-discharge for patients with asthma.
`94010`	Spirometry, including graphic record, when performed	Performed alongside asthma history documentation to assess current lung function when indicated.
`94640`	Pressurized or nonpressurized inhalation treatment for acute airway obstruction	Procedure that may be performed during the same encounter for symptomatic asthma and followed by documentation of medication-dispensing history.

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