ICD-10 Code for Strabismus

The default ICD-10-CM 2027 code for strabismus (congenital) (nonparalytic) is H50.9 – Unspecified strabismus. More specific codes depend on the details documented, as listed in the official index (48 codes, 27 billable).

Main code: H50.9 – Unspecified strabismus
Billable: Yes

Index entries for Strabismus

concomitant – H50.40
- convergent – see Strabismus, convergent concomitant
- divergent – see Strabismus, divergent concomitant
convergent concomitant – H50.00
- accommodative component – H50.43
- alternating – H50.05
  - with
    - A pattern – H50.06
    - specified nonconcomitances NEC – H50.08
    - V pattern – H50.07
- monocular – H50.01- (header)
  - with
    - A pattern – H50.02- (header)
    - specified nonconcomitances NEC – H50.04- (header)
    - V pattern – H50.03- (header)
  - intermittent – H50.31- (header)
    - alternating – H50.32
cyclotropia – H50.41 (header)
divergent concomitant – H50.10
- alternating – H50.15
  - with
    - A pattern – H50.16
    - specified noncomitances NEC – H50.18
    - V pattern – H50.17
- monocular – H50.11- (header)
  - with
    - A pattern – H50.12- (header)
    - specified noncomitances NEC – H50.14- (header)
    - V pattern – H50.13- (header)
  - intermittent – H50.33 (header)
    - alternating – H50.34
Duane's syndrome – H50.81- (header)
due to adhesions, scars – H50.69
heterophoria – H50.50
- alternating – H50.55
- cyclophoria – H50.54
- esophoria – H50.51
- exophoria – H50.52
- vertical – H50.53
heterotropia – H50.40
- intermittent – H50.30
hypertropia – H50.2- (header)
hypotropia – see Hypertropia
latent – H50.50
mechanical – H50.60
- Brown's sheath syndrome – H50.61- (header)
- specified type NEC – H50.69
monofixation syndrome – H50.42
paralytic – H49.9
- abducens nerve – H49.2- (header)
- fourth nerve – H49.1- (header)
- Kearns-Sayre syndrome – H49.81- (header)
- ophthalmoplegia (external)
  - progressive – H49.4- (header)
    - with pigmentary retinopathy – H49.81- (header)
  - total – H49.3- (header)
- sixth nerve – H49.2- (header)
- specified type NEC – H49.88- (header)
- third nerve – H49.0- (header)
- trochlear nerve – H49.1- (header)
specified type NEC – H50.89
vertical – H50.2- (header)

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.