Which coding system was used for diagnoses on claims prior to ICD-10-CM, as in 2013?

Which coding system was used for diagnoses on claims prior to ICD-10-CM, as in 2013?

• A. CPT
• B. HCPCS
• C. ICD-10-CM
• D. ICD-9-CM

Answer: (D)

Diagnoses on claims before ICD-10-CM were coded with ICD-9-CM. This older diagnosis coding system was used to indicate patient conditions on claims, while procedures and services are described with CPT, and HCPCS covers additional procedure and supply codes. ICD-10-CM is a later, more detailed diagnosis coding system that was implemented after 2013, so in 2013 the standard for diagnosis coding on claims was ICD-9-CM.

Diagnoses on claims before ICD-10-CM were coded with ICD-9-CM. This older diagnosis coding system was used to indicate patient conditions on claims, while procedures and services are described with CPT, and HCPCS covers additional procedure and supply codes. ICD-10-CM is a later, more detailed diagnosis coding system that was implemented after 2013, so in 2013 the standard for diagnosis coding on claims was ICD-9-CM.