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A27.89 ICD-10-CM Code: Other forms of leptospirosis

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

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 023 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITH MCC OR ANTINEOPLASTIC IMPLANT OR EPILEPSY WITH NEUROSTIMULATOR (MDC 01)
  • MS-DRG 024 — CRANIOTOMY WITH MAJOR DEVICE IMPLANT OR ACUTE COMPLEX CNS PRINCIPAL DIAGNOSIS WITHOUT MCC (MDC 01)
  • MS-DRG 097 — NON-BACTERIAL INFECTION OF NERVOUS SYSTEM EXCEPT VIRAL MENINGITIS WITH MCC (MDC 01)
  • MS-DRG 098 — NON-BACTERIAL INFECTION OF NERVOUS SYSTEM EXCEPT VIRAL MENINGITIS WITH CC (MDC 01)
  • MS-DRG 099 — NON-BACTERIAL INFECTION OF NERVOUS SYSTEM EXCEPT VIRAL MENINGITIS WITHOUT CC/MCC (MDC 01)

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.

Coder workflow for A27.89

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

Before you code A27.89

  1. “Other” (NEC) means the condition is specified in the record but no dedicated code captures it. Confirm the documented form is not one a sibling code names before settling on A27.89; if the record states no specifics at all, the unspecified sibling applies instead. “Other” codes are for documented conditions the classification gives no specific code; “unspecified” codes are for records lacking the detail (Guidelines I.A.9.a, I.A.9.b).

    ReviewA27.81

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

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

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

The comparisons, hierarchy, index entries, guidelines, relationships, risk-adjustment and coverage context a coder commonly needs. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Other forms of leptospirosis is a billable ICD-10-CM diagnosis code (A27.89).

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

Indexed Clinical Terms (12)

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.

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 A27.89 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 6 Excludes2 notes: A65 — Nonvenereal syphilis (via A27.-), A65-A69 — Other spirochetal diseases (A65-A69) (via A27.-), A66 — Yaws (via A27.-), A67 — Pinta [carate] (via A27.-), A68 — Relapsing fevers (via A27.-), A69 — Other spirochetal infections (via A27.-).

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

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 4 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 5 MS-DRGs: DRG 023 (MDC 01), DRG 024 (MDC 01), DRG 097 (MDC 01), DRG 098 (MDC 01), DRG 099 (MDC 01).

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

Clinical classification (AHRQ CCSR):INF003 — Bacterial 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.

A27.0 — Leptospirosis icterohemorrhagica, A27.81 — Aseptic meningitis in leptospirosis, A27.9 — Leptospirosis, unspecified

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Bacterial infections).

+399 more

Same Index main term, other category

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

A01.1 — Paratyphoid fever A (paratyphoid, A), A01.2 — Paratyphoid fever B (paratyphoid, B), A01.3 — Paratyphoid fever C (paratyphoid, C), A01.4 — Paratyphoid fever, unspecified (paratyphoid), A02.8 — Other specified salmonella infections (swine), A23.1 — Brucellosis due to Brucella abortus (abortus), A23.9 — Brucellosis, unspecified (Malta), A25.0 — Spirillosis (spirillary), A25.1 — Streptobacillosis (Haverhill), A25.9 — Rat-bite fever, unspecified (rat-bite), A28.1 — Cat-scratch disease (cat-scratch), A38.9 — Scarlet fever, uncomplicated (scarlet), A39.0 — Meningococcal meningitis (petechial), A44.0 — Systemic bartonellosis (Oroya), A48.2 — Nonpneumonic Legionnaires' disease [Pontiac fever] (Pontiac), A48.4 — Brazilian purpuric fever (Brazilian purpuric), A68.0 — Louse-borne relapsing fever (relapsing, louse-borne), A68.1 — Tick-borne relapsing fever (mianeh), A68.9 — Relapsing fever, unspecified (relapsing), A70 — Chlamydia psittaci infections (parrot), +107 more

Contextual Map

Every relationship of A27.89 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 A27.89 with these 6 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

  • A65 — Nonvenereal syphilis[Excludes2](via A27.-): “leptospirosis (A27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • A65-A69 — Other spirochetal diseases (A65-A69)[Excludes2](via A27.-): “leptospirosis (A27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • A66 — Yaws[Excludes2](via A27.-): “leptospirosis (A27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • A67 — Pinta [carate][Excludes2](via A27.-): “leptospirosis (A27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • A68 — Relapsing fevers[Excludes2](via A27.-): “leptospirosis (A27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • A69 — Other spirochetal infections[Excludes2](via A27.-): “leptospirosis (A27.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — 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. 8,919 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries (12)

  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor), Fort Bragg[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor), pretibial[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor), seven day (leptospirosis) (autumnal) (Japanese)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Fort Bragg fever[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Infection, infected, infective (opportunistic), Leptospira interrogans, autumnalis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Infection, infected, infective (opportunistic), Leptospira interrogans, canicola[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Infection, infected, infective (opportunistic), Leptospira interrogans, hebdomadis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Infection, infected, infective (opportunistic), Leptospira interrogans, pomona[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • and 4 more

Nearest codes

Change history

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

Deep reference

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

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 20, 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. "A27.89 — Other forms of leptospirosis." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/a27.89-other-forms-of-leptospirosis

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Other forms of leptospirosis

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 A27.89 in its code family, with their registry titles.

View all codes in the A27 family