Medical Code Systems

Outpatient claims use two core code systems together: ICD-10-CM for the diagnosis (the "why") and HCPCS/CPT for the procedure, supply, or drug (the "what"). Browse each below.

ICD-10-CM Diagnosis Codes

70,000+ diagnosis codes across 21 chapters, with billable status, includes/excludes notes, and official 2026 coding guidance. Browse ICD-10-CM →

HCPCS Level II Codes

CMS public-domain codes for supplies, durable medical equipment, drugs (J-codes), and services — with Medicare coverage and pricing. Browse HCPCS Level II →

Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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