Summary & Overview
HCPCS G4004: Endocrinology MIPS Specialty Set
HCPCS Level II code G4004 denotes the Endocrinology MIPS specialty set, a code tied to quality reporting for clinicians and groups providing endocrinology care. Nationally, this code matters because it links endocrinology providers to Merit-based Incentive Payment System (MIPS) reporting requirements and specialty-specific performance measures that can affect payment adjustments and public quality reporting. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn what G4004 represents in clinical and billing workflows, which payers commonly recognize the code, and the broader administrative context for endocrinology quality reporting. The publication covers benchmark concepts and policy context relevant to specialty MIPS sets, clarifies typical sites of service for reporting activities, and highlights practical considerations for coding and documentation. Data not available in the input is specifically noted where applicable, including detailed payer-specific reimbursement rates, associated taxonomies, and linked ICD-10 diagnoses.
Billing Code Overview
HCPCS Level II code G4004 represents the Endocrinology MIPS specialty set, a service identifier used for quality reporting tied to endocrinology-focused performance measures. The code designates activities related to the Medicare Quality Payment Program's reporting for the endocrinology specialty and is used in administrative and billing contexts to indicate participation in that specialty's MIPS measure set.
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Service type: Quality reporting and performance measure reporting for endocrinology
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Typical site of service: Outpatient endocrinology clinics and ambulatory care settings
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with complex endocrine conditions such as poorly controlled type 1 or type 2 diabetes, thyroid dysfunction, adrenal insufficiency, pituitary disorders, or metabolic bone disease who is followed in an endocrinology specialty clinic. The clinical workflow begins with a referral from primary care or a hospital discharge summary. On arrival, the patient undergoes a focused endocrinology history and physical, medication reconciliation, and review of recent laboratory and imaging results (for example, glucose logs, HbA1c, thyroid function tests, morning cortisol, or bone density reports). The endocrinologist or advanced practice clinician performs diagnostic assessment, adjusts medical therapy, and documents goals of care, counseling, and treatment plan. Order sets commonly include laboratory testing, endocrine-specific imaging, medication changes (insulin regimen adjustments, thyroid hormone dosing, corticosteroid or mineralocorticoid titration), and patient education on self-management. Follow-up scheduling, referral for diabetes education or insulin pump/continuous glucose monitor management, and communication with the referring provider conclude the visit. Typical sites of service are outpatient specialty clinics, hospital-based outpatient departments, and telemedicine visits when permitted by payer policy. For reporting quality measures under the endocrinology MIPS specialty set, documentation emphasizes diagnosis, treatment decisions, counseling, and objective data such as laboratory values and monitoring plans.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 |