ICD-10 Code for Narrowing

The ICD-10-CM 2027 alphabetic index lists narrowing with the subterms below. More specific codes depend on the details documented, as listed in the official index (13 codes, 13 billable).

Index entries for Narrowing

artery – I77.1
- auditory, internal – I65.8
- basilar – see Occlusion, artery, basilar
- carotid – see Occlusion, artery, carotid
- cerebellar – see Occlusion, artery, cerebellar
- cerebral – see Occlusion artery, cerebral
- choroidal – see Occlusion, artery, precerebral, specified NEC
- communicating posterior – see Occlusion, artery, precerebral, specified NEC
- coronary – see also Disease, heart, ischemic, atherosclerotic
  - congenital – Q24.5
    - syphilitic – A50.54 – I52 [manifestation]
  - due to syphilis NEC – A52.06
- hypophyseal – see Occlusion, artery, precerebral, specified NEC
- pontine – see Occlusion, artery, precerebral, specified NEC
- precerebral – see Occlusion, artery, precerebral
- vertebral – see Occlusion, artery, vertebral
auditory canal (external) – see Stenosis, external ear canal
caudal septum, fixed, lower lateral cartilage, alar rim and nasal sill – J34.8211
eustachian tube – see Obstruction, eustachian tube
eyelid – see Disorder, eyelid function
larynx – J38.6
mesenteric artery – K55.059 – see also Ischemia, intestine, acute
nasal septum, head of the inferior turbinate and the upper lateral cartilage – J34.8201
palate – M26.89
palpebral fissure – see Disorder, eyelid function
ureter – N13.5
- with infection – N13.6
urethra – see Stricture, urethra

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.