H57.02 ICD-10-CM Code: Anisocoria

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Anisocoria (pupil)
• Anomaly, anomalous (congenital) (unspecified type), pupil, function, anisocoria

Don’t confuse H57.02 with…

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

The codes most likely to be picked instead of H57.02 — 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.

• H57.00— 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 anomaly of pupillary function” takes H57.00; specificity in the record moves it back here.

  Full comparison: H57.02 vs H57.00 →

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

• No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 1 MS-DRG: DRG 123 (MDC 02).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):EYE012 — Other specified eye disorders (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified eye disorders).

H55.01 — Congenital nystagmus, H55.02 — Latent nystagmus, H55.03 — Visual deprivation nystagmus, H55.04 — Dissociated nystagmus, H55.09 — Other forms of nystagmus, H55.81 — Deficient saccadic eye movements, H55.82 — Deficient smooth pursuit eye movements, H55.89 — Other irregular eye movements, H57.00 — Unspecified anomaly of pupillary function, H57.01 — Argyll Robertson pupil, atypical, H57.03 — Miosis, H57.04 — Mydriasis, H57.051 — Tonic pupil, right eye, H57.052 — Tonic pupil, left eye, H57.053 — Tonic pupil, bilateral, H57.059 — Tonic pupil, unspecified eye, H57.09 — Other anomalies of pupillary function, H57.10 — Ocular pain, unspecified eye, H57.11 — Ocular pain, right eye, H57.12 — Ocular pain, left eye, +260 more

Same Index main term, other category

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

A50.56 — Late congenital syphilitic osteochondropathy (tibia NEC, saber), A50.57 — Syphilitic saddle nose (saddle nose, syphilitic), D72.0 — Genetic anomalies of leukocytes (May), E64.3 — Sequelae of rickets (pelvis NEC, rachitic), E70.330 — Chediak-Higashi syndrome (Chédiak-Higashi), I42.4 — Endocardial fibroelastosis (heart, fibroelastosis cordis), I45.6 — Pre-excitation syndrome (atrioventricular, excitation), K00.2 — Abnormalities of size and form of teeth (form, teeth), K00.6 — Disturbances in tooth eruption (tooth, teeth, eruption), K00.9 — Disorder of tooth development, unspecified (tooth, teeth), K04.3 — Abnormal hard tissue formation in pulp (hard tissue formation in pulp), L81.9 — Disorder of pigmentation, unspecified (pigmentation), M26.00 — Unspecified anomaly of jaw size (dentofacial, jaw size), M26.01 — Maxillary hyperplasia (dentofacial, jaw size, maxillary, hyperplasia), M26.02 — Maxillary hypoplasia (dentofacial, jaw size, maxillary, hypoplasia), M26.03 — Mandibular hyperplasia (dentofacial, jaw size, mandibular, hyperplasia), M26.04 — Mandibular hypoplasia (dentofacial, jaw size, mandibular, hypoplasia), M26.05 — Macrogenia (dentofacial, jaw size, macrogenia), M26.06 — Microgenia (dentofacial, jaw size, microgenia), M26.09 — Other specified anomalies of jaw size (dentofacial, jaw size, specified type NEC), +230 more

Contextual Map

Every relationship of H57.02 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.

Hierarchy

• H00-H59 — Chapter 7: Diseases of the Eye and Adnexa (H00-H59) (H00-H59)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H55-H57 — Other disorders of eye and adnexa[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Clinical classification (CCSR)

• EYE012 — Other specified eye disorders[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• DRG 123 — NEUROLOGICAL EYE DISORDERS[MS-DRG]: “NEUROLOGICAL EYE DISORDERS (MDC 02)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 02 — Diseases and Disorders of the Eye[MDC crossing]: “Diseases and Disorders of the Eye — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1,200 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Anisocoria (pupil)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Anomaly, anomalous (congenital) (unspecified type), pupil, function, anisocoria[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (30)

• H57 — Other disorders of eye and adnexa[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.0 — Anomalies of pupillary function[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.00 — Unspecified anomaly of pupillary function[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.01 — Argyll Robertson pupil, atypical[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.03 — Miosis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.04 — Mydriasis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.05 — Tonic pupil[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• H57.051 — Tonic pupil, right eye[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 22 more

Change history

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

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

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 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 H57.02 in its code family, with their registry titles.

• H57 — Other disorders of eye and adnexa
• H57.0 — Anomalies of pupillary function
• H57.00 — Unspecified anomaly of pupillary function
• H57.01 — Argyll Robertson pupil, atypical
• H57.03 — Miosis
• H57.04 — Mydriasis
• H57.05 — Tonic pupil
• H57.051 — Tonic pupil, right eye
• H57.052 — Tonic pupil, left eye
• H57.053 — Tonic pupil, bilateral

View all codes in the H57 family