ICD-10-CM 2027
ICD-10 code for strabismus
From the official ICD-10-CM alphabetic index entry “Strabismus (congenital) (nonparalytic)”. Page updated September 29, 2026.
About coding strabismus
The ICD-10-CM code for strabismus is H50.9 (Unspecified strabismus). The official index lists 54 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H50.9.
Within H50, choose H50.9 (Unspecified strabismus) only when documentation doesn't support a more specific option: esotropia (H50.0), exotropia (H50.1), vertical strabismus (H50.2), intermittent heterotropia (H50.3), other and unspecified heterotropia (H50.4), heterophoria (H50.5), mechanical strabismus (H50.6) and other specified strabismus (H50.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific strabismus codes (official index)
- concomitant H50.40 — Unspecified heterotropia
- convergent
- divergent
- convergent concomitant H50.00 — Unspecified esotropia
- accommodative component H50.43 — Accommodative component in esotropia
- alternating H50.05 — Alternating esotropia
- with
- A pattern H50.06 — Alternating esotropia with A pattern
- specified nonconcomitances NEC H50.08 — Alternating esotropia with other noncomitancies
- V pattern H50.07 — Alternating esotropia with V pattern
- monocular H50.01 — Monocular esotropia
- with
- A pattern H50.02 — Monocular esotropia with A pattern
- specified nonconcomitances NEC H50.04 — Monocular esotropia with other noncomitancies
- V pattern H50.03 — Monocular esotropia with V pattern
- intermittent H50.31 — Intermittent monocular esotropia
- alternating H50.32 — Intermittent alternating esotropia
- cyclotropia H50.41 — Cyclotropia
- divergent concomitant H50.10 — Unspecified exotropia
- alternating H50.15 — Alternating exotropia
- with
- A pattern H50.16 — Alternating exotropia with A pattern
- specified noncomitances NEC H50.18 — Alternating exotropia with other noncomitancies
- V pattern H50.17 — Alternating exotropia with V pattern
- monocular H50.11 — Monocular exotropia
- with
- A pattern H50.12 — Monocular exotropia with A pattern
- specified noncomitances NEC H50.14 — Monocular exotropia with other noncomitancies
- V pattern H50.13 — Monocular exotropia with V pattern
- intermittent H50.33 — Intermittent monocular exotropia
- alternating H50.34 — Intermittent alternating exotropia
- Duane's syndrome H50.81 — Duane's syndrome
- due to adhesions, scars H50.69 — Other mechanical strabismus
- heterophoria H50.50 — Unspecified heterophoria
- alternating H50.55 — Alternating heterophoria
- cyclophoria H50.54 — Cyclophoria
- esophoria H50.51 — Esophoria
- exophoria H50.52 — Exophoria
- vertical H50.53 — Vertical heterophoria
- heterotropia H50.40 — Unspecified heterotropia
- intermittent H50.30 — Unspecified intermittent heterotropia
- hypertropia H50.2 — Vertical strabismus
- hypotropia
- latent H50.50 — Unspecified heterophoria
- mechanical H50.60 — Mechanical strabismus, unspecified
- Brown's sheath syndrome H50.61 — Brown's sheath syndrome
- specified type NEC H50.69 — Other mechanical strabismus
- monofixation syndrome H50.42 — Monofixation syndrome
- paralytic H49.9 — Unspecified paralytic strabismus
- abducens nerve H49.2 — Sixth [abducent] nerve palsy
- fourth nerve H49.1 — Fourth [trochlear] nerve palsy
- Kearns-Sayre syndrome H49.81 — Kearns-Sayre syndrome
- ophthalmoplegia (external)
- progressive H49.4 — Progressive external ophthalmoplegia
- with pigmentary retinopathy H49.81 — Kearns-Sayre syndrome
- total H49.3 — Total (external) ophthalmoplegia
- sixth nerve H49.2 — Sixth [abducent] nerve palsy
- specified type NEC H49.88 — Other paralytic strabismus
- third nerve H49.0 — Third [oculomotor] nerve palsy
- trochlear nerve H49.1 — Fourth [trochlear] nerve palsy
- specified type NEC H50.89 — Other specified strabismus
- vertical H50.2 — Vertical strabismus
Common questions about strabismus ICD-10 codes
What is the ICD-10 code for strabismus?
- H50.9 — Unspecified strabismus. More specific codes apply when the documentation supports them: H50.40, H50.00, H50.43, H50.05 and others below.
What is the ICD-10 code for concomitant strabismus?
- H50.40 — Unspecified heterotropia.
What is the ICD-10 code for convergent concomitant strabismus?
- H50.00 — Unspecified esotropia.
What is the ICD-10 code for cyclotropia strabismus?
- H50.41 — Cyclotropia (header code; choose a more specific subcode).
What is the ICD-10 code for divergent concomitant strabismus?
- H50.10 — Unspecified exotropia.
What is the ICD-10 code for duane's syndrome strabismus?
- H50.81 — Duane's syndrome (header code; choose a more specific subcode).
What is the ICD-10 code for heterophoria strabismus?
- H50.50 — Unspecified heterophoria.
Is H50.9 billable?
- Yes. H50.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H50.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H50.9 as a principal diagnosis.
Is H50.9 a CC or MCC?
- No. H50.9 is neither a CC nor an MCC under MS-DRG v44.0.