Guide
Understanding HCPCS Codes
What Medicaid billing codes mean, how they're structured, and which ones are most commonly associated with fraud.
What Are HCPCS Codes?
HCPCS (Healthcare Common Procedure Coding System) codes are the standardized billing codes used for Medicaid and Medicare claims. Every service, procedure, drug, or supply billed to Medicaid has a corresponding HCPCS code.
Our dataset contains 10,881 unique HCPCS codes across 227 million billing records. Understanding what these codes represent is essential for interpreting billing patterns and fraud signals.
Codes fall into two levels: Level I (CPT codes, 5 digits, for physician services) and Level II (letter + 4 digits, for supplies, drugs, ambulance, and state-specific services).
Code Categories
E/M Codes
Evaluation & Management — office visits, hospital care, consultations. The backbone of outpatient billing.
Example: 99213 = Established patient office visit, moderate complexity
T-Codes
State Medicaid-specific codes not covered by national HCPCS. Includes personal care, transportation, habilitation.
Example: T1019 = Personal care services, per 15 min ($86.9B total)
H-Codes
Behavioral health services — mental health, substance abuse, community support programs.
Example: H2015 = Comprehensive community support, per 15 min
J-Codes
Injectable drugs administered by providers. These reflect actual drug costs, not provider markup.
Example: J2326 = Nusinersen injection — $92,158 per claim average
A-Codes
Ambulance services and medical supplies — transport, catheters, test strips, DME supplies.
Example: A0427 = Ambulance service, ALS emergency transport
E-Codes
Durable Medical Equipment (DME) — wheelchairs, hospital beds, CPAP machines, oxygen.
Example: E0601 = CPAP device for sleep apnea
Codes Most Associated with Billing Anomalies
These codes appear most frequently in our flagged provider analysis. Having billing anomalies on these codes doesn't prove fraud — but these are the codes where unusual patterns are most common.
Largest single code. Home care agencies billing billions — hard to verify services delivered.
MA DDS entities billing 37-51× national median. Per-diem rates can mask overbilling.
15-minute increments are easy to inflate. CARES INC bills 5.8× median for this code.
Pandemic-era code that generated massive billing. Some providers billed thousands of tests.
City of Chicago bills $1,611 per trip vs $163 national median. Transport fraud is well-documented.
Explore All Procedure Codes
Browse 10,881 HCPCS codes with national benchmarks, top providers, and spending data.
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