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Q33.5 ICD-10-CM Code: Ectopic tissue in lung

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 205 — OTHER RESPIRATORY SYSTEM DIAGNOSES WITH MCC (MDC 04)
  • MS-DRG 206 — OTHER RESPIRATORY SYSTEM DIAGNOSES WITHOUT MCC (MDC 04)

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 tissue in lung is a billable ICD-10-CM diagnosis code (Q33.5).

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 (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.

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 Q33.5 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 Code Also instruction: P28 — Other respiratory conditions originating in the perinatal period (via Q33.-).

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 2 MS-DRGs: DRG 205 (MDC 04), DRG 206 (MDC 04).

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

Clinical classification (AHRQ CCSR):MAL007 — Respiratory congenital malformations (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 (Respiratory congenital malformations).

Q31.5 — Congenital laryngomalacia, Q31.8 — Other congenital malformations of larynx, Q31.9 — Congenital malformation of larynx, unspecified, Q32.0 — Congenital tracheomalacia, Q32.1 — Other congenital malformations of trachea, Q32.2 — Congenital bronchomalacia, Q32.3 — Congenital stenosis of bronchus, Q32.4 — Other congenital malformations of bronchus, Q33.0 — Congenital cystic lung, Q33.1 — Accessory lobe of lung, Q33.2 — Sequestration of lung, Q33.3 — Agenesis of lung, Q33.4 — Congenital bronchiectasis, Q33.6 — Congenital hypoplasia and dysplasia of lung, Q33.8 — Other congenital malformations of lung, Q33.9 — Congenital malformation of lung, unspecified, Q34.0 — Anomaly of pleura, Q34.1 — Congenital cyst of mediastinum, Q34.8 — Other specified congenital malformations of respiratory system, Q34.9 — Congenital malformation of respiratory system, unspecified, +10 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.

E24.3 — Ectopic ACTH syndrome (ACTH syndrome), 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), Q38.6 — Other congenital malformations of mouth (sebaceous glands of mouth), Q40.2 — Other specified congenital malformations of stomach (gastric mucosa), Q43.5 — Ectopic anus (anus), 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 (vesicae), Q79.59 — Other congenital malformations of abdominal wall (abdominal viscera, due to defect in anterior abdominal wall), +4 more

Contextual Map

Every relationship of Q33.5 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 Q33.5 with this related code in Claim Check

Hierarchy

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 04 — Diseases and Disorders of the Respiratory System[MDC crossing]: “Diseases and Disorders of the Respiratory 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. 3,998 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Ectopic, ectopia (congenital), bone and cartilage in lung[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Ectopic, ectopia (congenital), tissue in lung[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. "Q33.5 — Ectopic tissue in lung." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/q33.5-ectopic-tissue-in-lung

Change history

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

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 Q33.5 in its code family, with their registry titles.

View all codes in the Q33 family