ICD-10 Code for Strabismus
Also indexed as (congenital) (nonparalytic)
The ICD-10-CM code for strabismus is H50.9 — Unspecified strabismus. This is the code the Alphabetic Index gives for strabismus with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
H50.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which strabismus code should you use?
The Alphabetic Index lists 48 codes under Strabismus. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| concomitant | H50.40 | Unspecified heterotropia | |
| convergent concomitant | H50.00 | Unspecified esotropia | |
| cyclotropia | H50.41 | Cyclotropia | not billable |
| divergent concomitant | H50.10 | Unspecified exotropia | |
| Duane's syndrome | H50.81 | Duane's syndrome | not billable |
| due to adhesions, scars | H50.69 | Other mechanical strabismus | |
| heterophoria | H50.50 | Unspecified heterophoria | |
| heterotropia | H50.40 | Unspecified heterotropia | |
| hypertropia | H50.2 | Vertical strabismus | not billable |
| latent | H50.50 | Unspecified heterophoria | |
| mechanical | H50.60 | Mechanical strabismus, unspecified | |
| monofixation syndrome | H50.42 | Monofixation syndrome | |
| paralytic | H49.9 | Unspecified paralytic strabismus | |
| specified type NEC | H50.89 | Other specified strabismus | |
| vertical | H50.2 | Vertical strabismus | not billable |
Strabismus convergent concomitant
| accommodative component | H50.43 | Accommodative component in esotropia | |
| alternating | H50.05 | Alternating esotropia | |
| monocular | H50.01 | Monocular esotropia | not billable |
| monocular › intermittent | H50.31 | Intermittent monocular esotropia | not billable |
| alternating › with › A pattern | H50.06 | Alternating esotropia with A pattern | |
| alternating › with › specified nonconcomitances NEC | H50.08 | Alternating esotropia with other noncomitancies | |
| alternating › with › V pattern | H50.07 | Alternating esotropia with V pattern | |
| monocular › with › A pattern | H50.02 | Monocular esotropia with A pattern | not billable |
| monocular › with › specified nonconcomitances NEC | H50.04 | Monocular esotropia with other noncomitancies | not billable |
| monocular › with › V pattern | H50.03 | Monocular esotropia with V pattern | not billable |
| monocular › intermittent › alternating | H50.32 | Intermittent alternating esotropia |
Strabismus divergent concomitant
| alternating | H50.15 | Alternating exotropia | |
| monocular | H50.11 | Monocular exotropia | not billable |
| monocular › intermittent | H50.33 | Intermittent monocular exotropia | not billable |
| alternating › with › A pattern | H50.16 | Alternating exotropia with A pattern | |
| alternating › with › specified noncomitances NEC | H50.18 | Alternating exotropia with other noncomitancies | |
| alternating › with › V pattern | H50.17 | Alternating exotropia with V pattern | |
| monocular › with › A pattern | H50.12 | Monocular exotropia with A pattern | not billable |
| monocular › with › specified noncomitances NEC | H50.14 | Monocular exotropia with other noncomitancies | not billable |
| monocular › with › V pattern | H50.13 | Monocular exotropia with V pattern | not billable |
| monocular › intermittent › alternating | H50.34 | Intermittent alternating exotropia |
Strabismus heterophoria
Strabismus heterotropia
| intermittent | H50.30 | Unspecified intermittent heterotropia |
Strabismus mechanical
Strabismus paralytic
| abducens nerve | H49.2 | Sixth [abducent] nerve palsy | not billable |
| fourth nerve | H49.1 | Fourth [trochlear] nerve palsy | not billable |
| Kearns-Sayre syndrome | H49.81 | Kearns-Sayre syndrome | not billable |
| sixth nerve | H49.2 | Sixth [abducent] nerve palsy | not billable |
| specified type NEC | H49.88 | Other paralytic strabismus | not billable |
| third nerve | H49.0 | Third [oculomotor] nerve palsy | not billable |
| trochlear nerve | H49.1 | Fourth [trochlear] nerve palsy | not billable |
| ophthalmoplegia › progressive | H49.4 | Progressive external ophthalmoplegia | not billable |
| ophthalmoplegia › total | H49.3 | Total (external) ophthalmoplegia | not billable |
| ophthalmoplegia › progressive › with pigmentary retinopathy | H49.81 | Kearns-Sayre syndrome | not billable |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources