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B73.00 ICD-10-CM Code: Onchocerciasis with eye involvement, unspecified

Compare with another code for B73.00Check this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
3 inclusion terms

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Includesfrom B73What B73 covers
  • onchocerca volvulus infection
  • onchocercosis
  • river blindness

Where it sits Source: CMS/NCHS

Under:Chapter 1: Certain Infectious and Parasitic DiseasesB65-B83 HelminthiasesB73 OnchocerciasisB73.0 Onchocerciasis with eye disease

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 867 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH MCC (MDC 18)
  • MS-DRG 868 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITH CC (MDC 18)
  • MS-DRG 869 — OTHER INFECTIOUS AND PARASITIC DISEASES DIAGNOSES WITHOUT CC/MCC (MDC 18)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for B73.00 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on B73.00 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • onchocerca volvulus infection
  • onchocercosis
  • river blindness

Source: inherited from B73

Coder workflow for B73.00

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

Before you code B73.00

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, B73.00 may be the appropriate code. Check the record for detail that supports a more specific sibling — in this subcategory the siblings differ by the presence or absence of the associated condition. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    ReviewB73.01, B73.02, B73.09

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. B73.00’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 →

Choose the right path

  1. Does the record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — B73.00 is appropriate when the documentation goes no further.

    ReviewB73.01, B73.02, B73.09

Consider B73.00. 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).
Any detail beyond this code’s title
What the record states that a more specific code would capture — or its absence, which itself supports the unspecified code.

Coding decision scenarios

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

Documentation: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the specific siblings in this subcategory and what each requires the record to state.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

ReviewB73.01, B73.02, B73.09

Documentation: Only one of the components this code’s title joins is documented.

Coding question: Is B73.00 supported?

Path: Review the code for the documented component on its own.

Reason: A combination code is assigned only when it fully identifies the documented conditions; otherwise the documented component takes its own code (Guidelines I.B.9).

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.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Onchocerciasis with eye involvement, unspecified is a billable ICD-10-CM diagnosis code (B73.00).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). 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-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name B73.00 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: 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 (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 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); EYE012 — Other specified eye disorders.

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, B73.01 — Onchocerciasis with endophthalmitis, B73.02 — Onchocerciasis with glaucoma, 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 categories (Parasitic, other specified and unspecified infections, Other specified eye disorders).

B69.81 — Myositis in cysticercosis, B69.89 — Cysticercosis of other sites, 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, B73.01 — Onchocerciasis with endophthalmitis, B73.02 — Onchocerciasis with glaucoma, 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, +510 more

Same Index main term, other category

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

B68.0 — Taenia solium taeniasis (pork tapeworm), B68.1 — Taenia saginata taeniasis (beef tapeworm), B68.9 — Taeniasis, unspecified (Taenia), B70.0 — Diphyllobothriasis (fish tapeworm), B70.1 — Sparganosis (Sparganum), B71.0 — Hymenolepiasis (Hymenolepis), B71.1 — Dipylidiasis (cestodes, dipylidiasis), B71.8 — Other specified cestode infections (Diplogonoporus), B71.9 — Cestode infection, unspecified (tapeworm), B72 — Dracunculiasis (Medina), B74.0 — Filariasis due to Wuchereria bancrofti (Wuchereria), B74.1 — Filariasis due to Brugia malayi (Brugia), B74.2 — Filariasis due to Brugia timori (Brugia, timori), B74.3 — Loiasis (eyeworm), B74.4 — Mansonelliasis (Mansonella), B74.8 — Other filariases (filarial, specified type NEC), B74.9 — Filariasis, unspecified (filarial), B75 — Trichinellosis (Trichinella), B76.0 — Ancylostomiasis (Ancylostoma, ankylostoma), B76.1 — Necatoriasis (Necator americanus), +59 more

Contextual Map

Every relationship of B73.00 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 B73.00 with these 3 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

Referenced by Code First instructions

Clinical classification (CCSR)

MS-DRG Grouper

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 · FY2027

Index entries

  • Infestation, filarial, due to, Onchocerca volvulus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Infestation, filarial, due to, Onchocerca volvulus, eye[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Infestation, microfilaria streptocerca, eye[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Onchocerciasis, onchocercosis, eye NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Onchocerciasis, onchocercosis, with, eye disease[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes

Change history

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

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (5)

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.

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 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 — v44 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-derived 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 editorial 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.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "B73.00 — Onchocerciasis with eye involvement, unspecified." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/b73.00-onchocerciasis-with-eye-involvement-unspecified

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Onchocerciasis with eye involvement, unspecified

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to B73.00 in its code family, with their registry titles.

View all codes in the B73 family