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Q43.5 ICD-10-CM Code: Ectopic anus

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 v43, Appendix B.

  • MS-DRG 393 — OTHER DIGESTIVE SYSTEM DIAGNOSES WITH MCC (MDC 06)
  • MS-DRG 394 — OTHER DIGESTIVE SYSTEM DIAGNOSES WITH CC (MDC 06)
  • MS-DRG 395 — OTHER DIGESTIVE SYSTEM DIAGNOSES WITHOUT CC/MCC (MDC 06)

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.

Code Overview

Ectopic anus is a billable ICD-10-CM diagnosis code (Q43.5).

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 (1)

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 (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

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 21 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 393 (MDC 06), DRG 394 (MDC 06), DRG 395 (MDC 06).

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

Clinical classification (AHRQ CCSR):MAL002 — Digestive congenital anomalies (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.

Q41.0 — Congenital absence, atresia and stenosis of duodenum, Q41.1 — Congenital absence, atresia and stenosis of jejunum, Q41.2 — Congenital absence, atresia and stenosis of ileum, Q41.8 — Congenital absence, atresia and stenosis of other specified parts of small intestine, Q41.9 — Congenital absence, atresia and stenosis of small intestine, part unspecified, Q42.0 — Congenital absence, atresia and stenosis of rectum with fistula, Q42.1 — Congenital absence, atresia and stenosis of rectum without fistula, Q42.2 — Congenital absence, atresia and stenosis of anus with fistula, Q42.3 — Congenital absence, atresia and stenosis of anus without fistula, Q42.8 — Congenital absence, atresia and stenosis of other parts of large intestine, Q42.9 — Congenital absence, atresia and stenosis of large intestine, part unspecified, Q43.0 — Meckel's diverticulum (displaced) (hypertrophic), Q43.1 — Hirschsprung's disease, Q43.2 — Other congenital functional disorders of colon, Q43.3 — Congenital malformations of intestinal fixation, Q43.4 — Duplication of intestine, Q43.6 — Congenital fistula of rectum and anus, Q43.7 — Persistent cloaca, Q43.8 — Other specified congenital malformations of intestine, Q43.9 — Congenital malformation of intestine, unspecified

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Digestive congenital anomalies).

Q42.1 — Congenital absence, atresia and stenosis of rectum without fistula, Q42.2 — Congenital absence, atresia and stenosis of anus with fistula, Q42.3 — Congenital absence, atresia and stenosis of anus without fistula, Q42.8 — Congenital absence, atresia and stenosis of other parts of large intestine, Q42.9 — Congenital absence, atresia and stenosis of large intestine, part unspecified, Q43.0 — Meckel's diverticulum (displaced) (hypertrophic), Q43.1 — Hirschsprung's disease, Q43.2 — Other congenital functional disorders of colon, Q43.3 — Congenital malformations of intestinal fixation, Q43.4 — Duplication of intestine, Q43.6 — Congenital fistula of rectum and anus, Q43.7 — Persistent cloaca, Q43.8 — Other specified congenital malformations of intestine, Q43.9 — Congenital malformation of intestine, unspecified, Q44.0 — Agenesis, aplasia and hypoplasia of gallbladder, Q44.1 — Other congenital malformations of gallbladder, Q44.2 — Atresia of bile ducts, Q44.3 — Congenital stenosis and stricture of bile ducts, Q44.4 — Choledochal cyst, Q44.5 — Other congenital malformations of bile ducts, +41 more

Same Index main term, other category

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

E34.2 — Ectopic hormone secretion, not elsewhere classified (hormone secretion NEC), I49.1 — Atrial premature depolarization (atrial beats), I49.3 — Ventricular premature depolarization (ventricular beats), I49.49 — Other premature depolarization (beats), Q04.8 — Other specified congenital malformations of brain (brain), Q12.1 — Congenital displaced lens (lens, lentis), Q24.8 — Other specified congenital malformations of heart (heart), Q33.5 — Ectopic tissue in lung (tissue in lung), Q38.6 — Other congenital malformations of mouth (sebaceous glands of mouth), Q40.2 — Other specified congenital malformations of stomach (gastric mucosa), Q45.3 — Other congenital malformations of pancreas and pancreatic duct (pancreas), Q45.8 — Other specified congenital malformations of digestive system (abdominal viscera), Q53.00 — Ectopic testis, unspecified (testis), Q53.01 — Ectopic testis, unilateral (testis, unilateral), Q53.02 — Ectopic testes, bilateral (testis, bilateral), Q62.63 — Anomalous implantation of ureter (ureter), Q63.2 — Ectopic kidney (renal), Q64.10 — Exstrophy of urinary bladder, unspecified (bladder), Q79.59 — Other congenital malformations of abdominal wall (abdominal viscera, due to defect in anterior abdominal wall), Q83.8 — Other congenital malformations of breast (breast tissue), +4 more

Contextual Map

Every relationship of Q43.5 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

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 06 — Diseases and Disorders of the Digestive System[MDC crossing]: “Diseases and Disorders of the Digestive 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. 5,744 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Ectopic, ectopia (congenital), anus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (10)

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

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. "Q43.5 — Ectopic anus." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/q43.5-ectopic-anus

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Ectopic anus

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), 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 Q43.5 in its code family, with their registry titles.

View all codes in the Q43 family