H50.12 ICD-10-CM Code: Monocular exotropia with A pattern

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for H50.12 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on H50.12 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for H50.12

MedCoder structured workflow — derived from this code’s own official record

Before you code H50.12

1. H50.12 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

   ReviewH50.121, H50.122

   See the relationships section · Guide: How to choose an ICD-10-CM code →

2. H50.12’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

   Guide: Combination codes →

3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with H50.12. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

   See the official tabular notes

Choose the right path

1. Does the documentation support one of the more specific codes beneath H50.12?
   Yes → Select that code and continue the checks below on its own page.
   No → H50.12 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewH50.121, H50.122

2. Does the documentation support a condition named in H50.12’s Excludes1 note?
   Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
   No → Continue.

   ReviewH50.33, H50.34

Consider H50.12. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

The associated condition or complication

Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

Official instructions as workflow

• Excludes1 — check before selecting H50.12(1 note)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with H50.12: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareH50.33, H50.34

  See the official tabular notes · Guidelines I.A.12.a

• Excludes2 — not part of H50.12(1 note)

  Coding workflow: The conditions named in this note are not included in H50.12. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareH55

  See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse H50.12 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of H50.12 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• H50.33— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of intermittent exotropia moves the case to H50.33; the two are not reported together unless documented as unrelated.

  Full comparison: H50.12 vs H50.33 →

• H50.34— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of intermittent exotropia moves the case to H50.34; the two are not reported together unless documented as unrelated.

  Full comparison: H50.12 vs H50.34 →

• H50.10— Specificity relationship (Review)

  Overlapping diagnoses in the same category.

  Overlapping codes in the same category — the documentation decides which is the more specific fit.

  What moves you there: A record that documents no more than “Unspecified exotropia” takes H50.10; specificity in the record moves it back here.

  Full comparison: H50.12 vs H50.10 →

• H55— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of nystagmus and other irregular eye movements adds H55; it is not part of this code and both may be reported when both are documented.

  Full comparison: H50.12 vs H55 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• Not billable as written — a more specific code is required: H50.121, H50.122.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name H50.12 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes2 note: H53.03 — Strabismic amblyopia (via H50.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Related Codes

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Strabismus”; these codes share that main term but sit in a different category of the Tabular List.

H49.0 — Third [oculomotor] nerve palsy (paralytic, third nerve), H49.1 — Fourth [trochlear] nerve palsy (paralytic, fourth nerve), H49.2 — Sixth [abducent] nerve palsy (paralytic, sixth nerve), H49.3 — Total (external) ophthalmoplegia (paralytic, ophthalmoplegia, total), H49.4 — Progressive external ophthalmoplegia (paralytic, ophthalmoplegia, progressive), H49.81 — Kearns-Sayre syndrome (paralytic, Kearns-Sayre syndrome), H49.88 — Other paralytic strabismus (paralytic, specified type NEC), H49.9 — Unspecified paralytic strabismus (paralytic)

Contextual Map

Every relationship of H50.12 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run H50.12 with this related code in Claim Check

Hierarchy

• H00-H59 — Chapter 7: Diseases of the Eye and Adnexa (H00-H59) (H00-H59)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H49-H52 — Disorders of ocular muscles, binocular movement, accommodation and refraction[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes2 notes

• H53.03 — Strabismic amblyopia[Excludes2](via H50.-): “strabismus (H50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Nearest codes (40)

• H50 — Other strabismus[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.011 — Monocular esotropia, right eye[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.012 — Monocular esotropia, left eye[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.02 — Monocular esotropia with A pattern[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.021 — Monocular esotropia with A pattern, right eye[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.022 — Monocular esotropia with A pattern, left eye[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.03 — Monocular esotropia with V pattern[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H50.031 — Monocular esotropia with V pattern, right eye[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Common coding questions

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to H50.12 in its code family, with their registry titles.

• H50.1 — Exotropia
• H50.10 — Unspecified exotropia
• H50.11 — Monocular exotropia
• H50.111 — Monocular exotropia, right eye
• H50.112 — Monocular exotropia, left eye
• H50.121 — Monocular exotropia with A pattern, right eye
• H50.122 — Monocular exotropia with A pattern, left eye
• H50.13 — Monocular exotropia with V pattern
• H50.131 — Monocular exotropia with V pattern, right eye
• H50.132 — Monocular exotropia with V pattern, left eye

View all codes in the H50 family