FY2027
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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).

BillableUnspecified

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

concomitantH50.40Unspecified heterotropia
convergent concomitantH50.00Unspecified esotropia
cyclotropiaH50.41Not billableCyclotropia
divergent concomitantH50.10Unspecified exotropia
Duane's syndromeH50.81Not billableDuane's syndrome
due to adhesions, scarsH50.69Other mechanical strabismus
heterophoriaH50.50Unspecified heterophoria
heterotropiaH50.40Unspecified heterotropia
hypertropiaH50.2Not billableVertical strabismus
latentH50.50Unspecified heterophoria
mechanicalH50.60Mechanical strabismus, unspecified
monofixation syndromeH50.42Monofixation syndrome
paralyticH49.9Unspecified paralytic strabismus
specified type NECH50.89Other specified strabismus
verticalH50.2Not billableVertical strabismus

Strabismus convergent concomitant

accommodative componentH50.43Accommodative component in esotropia
alternatingH50.05Alternating esotropia
monocularH50.01Not billableMonocular esotropia
monocular › intermittentH50.31Not billableIntermittent monocular esotropia
alternating › with › A patternH50.06Alternating esotropia with A pattern
alternating › with › specified nonconcomitances NECH50.08Alternating esotropia with other noncomitancies
alternating › with › V patternH50.07Alternating esotropia with V pattern
monocular › with › A patternH50.02Not billableMonocular esotropia with A pattern
monocular › with › specified nonconcomitances NECH50.04Not billableMonocular esotropia with other noncomitancies
monocular › with › V patternH50.03Not billableMonocular esotropia with V pattern
monocular › intermittent › alternatingH50.32Intermittent alternating esotropia

Strabismus divergent concomitant

alternatingH50.15Alternating exotropia
monocularH50.11Not billableMonocular exotropia
monocular › intermittentH50.33Not billableIntermittent monocular exotropia
alternating › with › A patternH50.16Alternating exotropia with A pattern
alternating › with › specified noncomitances NECH50.18Alternating exotropia with other noncomitancies
alternating › with › V patternH50.17Alternating exotropia with V pattern
monocular › with › A patternH50.12Not billableMonocular exotropia with A pattern
monocular › with › specified noncomitances NECH50.14Not billableMonocular exotropia with other noncomitancies
monocular › with › V patternH50.13Not billableMonocular exotropia with V pattern
monocular › intermittent › alternatingH50.34Intermittent alternating exotropia

Strabismus heterophoria

alternatingH50.55Alternating heterophoria
cyclophoriaH50.54Cyclophoria
esophoriaH50.51Esophoria
exophoriaH50.52Exophoria
verticalH50.53Vertical heterophoria

Strabismus heterotropia

intermittentH50.30Unspecified intermittent heterotropia

Strabismus mechanical

Brown's sheath syndromeH50.61Not billableBrown's sheath syndrome
specified type NECH50.69Other mechanical strabismus

Strabismus paralytic

abducens nerveH49.2Not billableSixth [abducent] nerve palsy
fourth nerveH49.1Not billableFourth [trochlear] nerve palsy
Kearns-Sayre syndromeH49.81Not billableKearns-Sayre syndrome
sixth nerveH49.2Not billableSixth [abducent] nerve palsy
specified type NECH49.88Not billableOther paralytic strabismus
third nerveH49.0Not billableThird [oculomotor] nerve palsy
trochlear nerveH49.1Not billableFourth [trochlear] nerve palsy
ophthalmoplegia › progressiveH49.4Not billableProgressive external ophthalmoplegia
ophthalmoplegia › totalH49.3Not billableTotal (external) ophthalmoplegia
ophthalmoplegia › progressive › with pigmentary retinopathyH49.81Not billableKearns-Sayre syndrome

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