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ICD-9-CM procedure code (retired)

00.21 — Intravascular imaging of extracranial cerebral vessels

ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-PCS equivalents from the CMS General Equivalence Mappings.

About ICD-9-CM 00.21

00.21 is an ICD-9-CM procedure code for intravascular imaging of extracranial cerebral vessels. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-PCS took over.

The CMS General Equivalence Mappings translate it to 6 ICD-10-PCS codes, such as B343ZZ3 (Ultrasonography of Right Common Carotid Artery, Intravascular), B344ZZ3 (Ultrasonography of Left Common Carotid Artery, Intravascular) and B345ZZ3 (Ultrasonography of Bilateral Common Carotid Arteries, Intravascular). All of these are approximate matches, so review the record to pick the right one.

ICD-10-PCS equivalents

Common questions about 00.21

What is the ICD-10 code for ICD-9 00.21?

The GEMs map 00.21 to ICD-10-PCS B343ZZ3, B344ZZ3, B345ZZ3, B346ZZ3, B347ZZ3 and B348ZZ3.

GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.