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Q26.5 ICD-10-CM Code: Anomalous portal venous connection

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 299 — PERIPHERAL VASCULAR DISORDERS WITH MCC (MDC 05)
  • MS-DRG 300 — PERIPHERAL VASCULAR DISORDERS WITH CC (MDC 05)
  • MS-DRG 301 — PERIPHERAL VASCULAR DISORDERS WITHOUT CC/MCC (MDC 05)

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

Anomalous portal venous connection is a billable ICD-10-CM diagnosis code (Q26.5).

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 (7)

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

  • 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

Other codes that name Q26.5 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: P29 — Cardiovascular disorders originating in the perinatal period (via Q26.-).

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

Referenced by 2 Code Also instructions across 2 chapters: I27.21 — Secondary pulmonary arterial hypertension (via Q26.-), Z71.87 — Encounter for pediatric-to-adult transition counseling (via Q26.-).

These codes suggest coding this condition alongside when both are present.

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 3 MS-DRGs: DRG 299 (MDC 05), DRG 300 (MDC 05), DRG 301 (MDC 05).

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

Clinical classification (AHRQ CCSR):MAL001 — Cardiac and circulatory 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 category (CCSR)

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

Q25.71 — Coarctation of pulmonary artery, Q25.72 — Congenital pulmonary arteriovenous malformation, Q25.79 — Other congenital malformations of pulmonary artery, Q25.8 — Other congenital malformations of other great arteries, Q25.9 — Congenital malformation of great arteries, unspecified, Q26.0 — Congenital stenosis of vena cava, Q26.1 — Persistent left superior vena cava, Q26.2 — Total anomalous pulmonary venous connection, Q26.3 — Partial anomalous pulmonary venous connection, Q26.4 — Anomalous pulmonary venous connection, unspecified, Q26.6 — Portal vein-hepatic artery fistula, Q26.8 — Other congenital malformations of great veins, Q26.9 — Congenital malformation of great vein, unspecified, Q27.0 — Congenital absence and hypoplasia of umbilical artery, Q27.1 — Congenital renal artery stenosis, Q27.2 — Other congenital malformations of renal artery, Q27.30 — Arteriovenous malformation, site unspecified, Q27.31 — Arteriovenous malformation of vessel of upper limb, Q27.32 — Arteriovenous malformation of vessel of lower limb, Q27.33 — Arteriovenous malformation of digestive system vessel, +87 more

Same Index main term, other category

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

Q25.44 — Congenital dilation of aorta (aorta, dilatation, congenital), Q25.45 — Double aortic arch (vascular, ring), Q25.48 — Anomalous origin of subclavian artery (origin, artery, subclavian), Q25.49 — Other congenital malformations of aorta (sinus of Valsalva), Q25.5 — Atresia of pulmonary artery (pulmonary), Q25.6 — Stenosis of pulmonary artery (pulmonary, artery, stenosis), Q25.72 — Congenital pulmonary arteriovenous malformation (pulmonary, arteriovenous), Q25.79 — Other congenital malformations of pulmonary artery (artery, pulmonary), Q25.8 — Other congenital malformations of other great arteries (origin, artery, innominate), Q25.9 — Congenital malformation of great arteries, unspecified (great, artery), Q27.0 — Congenital absence and hypoplasia of umbilical artery (artery, umbilical), Q27.2 — Other congenital malformations of renal artery (renal artery), Q27.30 — Arteriovenous malformation, site unspecified (arteriovenous, aneurysmatic), Q27.31 — Arteriovenous malformation of vessel of upper limb (arteriovenous, aneurysmatic, peripheral, upper limb), Q27.32 — Arteriovenous malformation of vessel of lower limb (arteriovenous, aneurysmatic, peripheral, lower limb), Q27.33 — Arteriovenous malformation of digestive system vessel (arteriovenous NEC, gastrointestinal), Q27.34 — Arteriovenous malformation of renal vessel (arteriovenous, aneurysmatic, peripheral, renal vessel), Q27.39 — Arteriovenous malformation, other site (arteriovenous, aneurysmatic, peripheral, other specified site), Q27.8 — Other specified congenital malformations of peripheral vascular system (artery), Q27.9 — Congenital malformation of peripheral vascular system, unspecified (vein), +476 more

Contextual Map

Every relationship of Q26.5 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.

Run Q26.5 with these 3 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 05 — Diseases and Disorders of the Circulatory System[MDC crossing]: “Diseases and Disorders of the Circulatory 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. 17,209 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Absence (of) (organ or part) (complete or partial), veincongenital NEC (peripheral), portal[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Agenesis, vein (s) (peripheral), portal[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Anomaly, anomalous (congenital) (unspecified type), connection, portal vein[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Anomaly, anomalous (congenital) (unspecified type), portal vein[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Anomaly, anomalous (congenital) (unspecified type), portal vein, connection[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Atresia, atretic, vein NEC, portal[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Malformation (congenital), great, vein, anomalous, portal venous connection[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (9)

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. "Q26.5 — Anomalous portal venous connection." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/q26.5-anomalous-portal-venous-connection

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Anomalous portal venous connection

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 Q26.5 in its code family, with their registry titles.

View all codes in the Q26 family