<P> HCPCS Level II codes are alphanumeric medical procedure codes, primarily for non-physician services such as ambulance services and prosthetic devices, . They represent items, supplies and non-physician services not covered by CPT - 4 codes (Level I). Level II codes are composed of a single letter in the range A to V, followed by 4 digits . Level II codes are maintained by the US Centers for Medicare and Medicaid Services (CMS). There is some overlap between HCPCS codes and National Drug Code (NDC) codes, with a subset of NDC codes also in HCPCS, and vice versa . The CMS maintains a crosswalk from NDC to HCPCS in the form of an Excel file . The crosswalk is updated quarterly . </P> <P> The letters at the beginning of HCPCS Level II codes have the following meanings: </P> <Ul> <Li> A-codes (example: A0021): Transportation, Medical & Surgical Supplies, Miscellaneous & Experimental </Li> <Li> B - codes (example: B4034): Enteral and Parenteral Therapy </Li> <Li> C - codes (example: C1300): Temporary Hospital Outpatient Prospective Payment System </Li> <Li> D - codes: Dental Procedures </Li> <Li> E-codes (example: E0100): Durable Medical Equipment </Li> <Li> G - codes (example: G0008): Temporary Procedures & Professional Services </Li> <Li> H - codes (example: H0001): Rehabilitative Services </Li> <Li> J - codes (example: J0120): Drugs Administered Other Than Oral Method, Chemotherapy Drugs </Li> <Li> K - codes (example: K0001): Temporary Codes for Durable Medical Equipment Regional Carriers </Li> <Li> L - codes (example: L0112): Orthotic / Prosthetic Procedures </Li> <Li> M - codes (example: M0064): Medical Services </Li> <Li> P - codes (example: P2028): Pathology and Laboratory </Li> <Li> Q - codes (example: Q0035): Temporary Codes </Li> <Li> R - codes (example: R0070): Diagnostic Radiology Services </Li> <Li> S - codes (example: S0012): Private Payer Codes </Li> <Li> T - codes (example: T1000): State Medicaid Agency Codes </Li> <Li> V - codes (example: V2020): Vision / Hearing Services </Li> </Ul> <Li> A-codes (example: A0021): Transportation, Medical & Surgical Supplies, Miscellaneous & Experimental </Li>

What is unique about hcpcs codes that begin with the letter t