B73.02 ICD-10-CM Code: Onchocerciasis with glaucoma

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for B73.02 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 B73.02 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for B73.02

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

Before you code B73.02

1. B73.02’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 →

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).

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.

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.

• Glaucoma, in (due to), onchocerciasis
• Onchocerciasis, onchocercosis, with, eye disease, glaucoma

Don’t confuse B73.02 with…

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

The codes most likely to be picked instead of B73.02 — 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.

• B73.00— 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 “Onchocerciasis with eye involvement, unspecified” takes B73.00; specificity in the record moves it back here.

  Full comparison: B73.02 vs B73.00 →

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

• CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

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 B73.02 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 Excludes1 note: H42 — Glaucoma in diseases classified elsewhere.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: J82 — Pulmonary eosinophilia, not elsewhere classified (via B73.-).

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

Referenced by 2 Code First instructions across 2 chapters: H94.0 — Acoustic neuritis in infectious and parasitic diseases classified elsewhere (via B73.-), K67 — Disorders of peritoneum in infectious diseases classified elsewhere (via B73.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 13 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 867 (MDC 18), DRG 868 (MDC 18), DRG 869 (MDC 18).

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

Clinical classification (AHRQ CCSR):INF009 — Parasitic, other specified and unspecified infections (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 process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

B72 — Dracunculiasis, B73.00 — Onchocerciasis with eye involvement, unspecified, B73.01 — Onchocerciasis with endophthalmitis, B73.09 — Onchocerciasis with other eye involvement, B73.1 — Onchocerciasis without eye disease, B74.0 — Filariasis due to Wuchereria bancrofti, B74.1 — Filariasis due to Brugia malayi, B74.2 — Filariasis due to Brugia timori, B74.3 — Loiasis, B74.4 — Mansonelliasis, B74.8 — Other filariases, B74.9 — Filariasis, unspecified

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Parasitic, other specified and unspecified infections).

B69.9 — Cysticercosis, unspecified, B70.0 — Diphyllobothriasis, B70.1 — Sparganosis, B71.0 — Hymenolepiasis, B71.1 — Dipylidiasis, B71.8 — Other specified cestode infections, B71.9 — Cestode infection, unspecified, B72 — Dracunculiasis, B73.00 — Onchocerciasis with eye involvement, unspecified, B73.01 — Onchocerciasis with endophthalmitis, B73.09 — Onchocerciasis with other eye involvement, B73.1 — Onchocerciasis without eye disease, B74.0 — Filariasis due to Wuchereria bancrofti, B74.1 — Filariasis due to Brugia malayi, B74.2 — Filariasis due to Brugia timori, B74.3 — Loiasis, B74.4 — Mansonelliasis, B74.8 — Other filariases, B74.9 — Filariasis, unspecified, B75 — Trichinellosis, +235 more

Same Index main term, other category

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

A18.59 — Other tuberculosis of eye (tuberculous), A52.71 — Late syphilitic oculopathy (syphilitic), E34.9 — Endocrine disorder, unspecified (in, endocrine disease NOS), E72.03 — Lowe's syndrome (in, Lowe's syndrome), E85.4 — Organ-limited amyloidosis (in, amyloidosis), E88.9 — Metabolic disorder, unspecified (in, metabolic disease NOS), H40.00 — Preglaucoma, unspecified (suspect), H40.10 — Unspecified open-angle glaucoma (open angle), H40.11 — Primary open-angle glaucoma (simple), H40.12 — Low-tension glaucoma (open angle, primary, low-tension), H40.13 — Pigmentary glaucoma (open angle, primary, pigmentary), H40.14 — Capsular glaucoma with pseudoexfoliation of lens (open angle, primary, capsular), H40.15 — Residual stage of open-angle glaucoma (open angle, primary, residual stage), H40.20 — Unspecified primary angle-closure glaucoma (angle-closure), H40.21 — Acute angle-closure glaucoma (angle-closure, acute), H40.22 — Chronic angle-closure glaucoma (angle-closure, chronic), H40.23 — Intermittent angle-closure glaucoma (angle-closure, intermittent), H40.24 — Residual stage of angle-closure glaucoma (angle-closure, residual stage), H40.3 — Glaucoma secondary to eye trauma (secondary, trauma), H40.4 — Glaucoma secondary to eye inflammation (secondary, inflammation), +13 more

Contextual Map

Every relationship of B73.02 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.

Run B73.02 with these 4 related codes in Claim Check

Hierarchy

• A00-B99 — Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99) (A00-B99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes

• H42 — Glaucoma in diseases classified elsewhere[Excludes1]: “glaucoma (in) onchocerciasis (B73.02)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• J82 — Pulmonary eosinophilia, not elsewhere classified[Excludes2](via B73.-): “pulmonary eosinophilia due to specified parasitic infection (B50-B83)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code First instructions

• H94.0 — Acoustic neuritis in infectious and parasitic diseases classified elsewhere[Code First](via B73.-): “parasitic disease (B65-B89)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• K67 — Disorders of peritoneum in infectious diseases classified elsewhere[Code First](via B73.-): “helminthiasis (B65.0 -B83.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• INF009 — Parasitic, other specified and unspecified infections[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 867 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH MCC[MS-DRG]: “OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH MCC (MDC 18)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 868 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH CC[MS-DRG]: “OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH CC (MDC 18)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 869 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITHOUT CC/MCC[MS-DRG]: “OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITHOUT CC/MCC (MDC 18)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 18 — Infectious and Parasitic Diseases, Systemic or Unspecified Sites[MDC crossing]: “Infectious and Parasitic Diseases, Systemic or Unspecified Sites — 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 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Glaucoma, in (due to), onchocerciasis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Onchocerciasis, onchocercosis, with, eye disease, glaucoma[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

• B73 — Onchocerciasis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• B73.0 — Onchocerciasis with eye disease[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• B73.00 — Onchocerciasis with eye involvement, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• B73.01 — Onchocerciasis with endophthalmitis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• B73.09 — Onchocerciasis with other eye involvement[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• B73.1 — Onchocerciasis without eye disease[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

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 B73.02 in its code family, with their registry titles.

• B73 — Onchocerciasis
• B73.0 — Onchocerciasis with eye disease
• B73.00 — Onchocerciasis with eye involvement, unspecified
• B73.01 — Onchocerciasis with endophthalmitis
• B73.09 — Onchocerciasis with other eye involvement
• B73.1 — Onchocerciasis without eye disease

View all codes in the B73 family