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Q89.9 ICD-10-CM Code: Congenital malformation, unspecified

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

Coding at a Glance

Tabular directives
2 inclusion terms

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 951 — OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)

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 Q89.9 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

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Congenital anomaly NOS
  • Congenital deformity NOS

Coder workflow for Q89.9

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

Before you code Q89.9

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, Q89.9 may be the appropriate code. Check the record for detail that supports a more specific sibling. 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).

    ReviewQ89.0, Q89.1, Q89.2, Q89.3, Q89.4, Q89.7, Q89.8

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

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 — Q89.9 is appropriate when the documentation goes no further.

    ReviewQ89.0, Q89.1, Q89.2, Q89.3, Q89.4, Q89.7, Q89.8

Consider Q89.9. 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).
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.

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).

ReviewQ89.0, Q89.1, Q89.2, Q89.3, Q89.4, Q89.7, Q89.8

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.

Code Overview

Congenital malformation, unspecified is a billable ICD-10-CM diagnosis code (Q89.9).

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

  • 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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 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 1 MS-DRG: DRG 951 (MDC 23).

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

Clinical classification (AHRQ CCSR):MAL010 — Other specified and unspecified 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 (Other specified and unspecified congenital anomalies).

Q87.43 — Marfan syndrome with skeletal manifestation, Q87.5 — Other congenital malformation syndromes with other skeletal changes, Q87.81 — Alport syndrome, Q87.82 — Arterial tortuosity syndrome, Q87.83 — Bardet-Biedl syndrome, Q87.84 — Laurence-Moon syndrome, Q87.85 — MED13L syndrome, Q87.87 — Hao-Fountain Syndrome, Q87.88 — CTNNB1 syndrome, Q87.89 — Other specified congenital malformation syndromes, not elsewhere classified, Q89.01 — Asplenia (congenital), Q89.09 — Congenital malformations of spleen, Q89.1 — Congenital malformations of adrenal gland, Q89.2 — Congenital malformations of other endocrine glands, Q89.3 — Situs inversus, Q89.4 — Conjoined twins, Q89.7 — Multiple congenital malformations, not elsewhere classified, Q89.8 — Other specified congenital malformations, Q89.81 — Kabuki syndrome, Q89.89 — Other specified congenital malformations, +59 more

Same Index main term, other category

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

Q79.9 — Congenital malformation of musculoskeletal system, unspecified (bone), Q82.8 — Other specified congenital malformations of skin (simian crease), Q82.9 — Congenital malformation of skin, unspecified (skin), Q83.8 — Other congenital malformations of breast (breast, specified type NEC), Q83.9 — Congenital malformation of breast, unspecified (nipple), Q84.2 — Other congenital malformations of hair (hair), Q84.6 — Other congenital malformations of nails (nail), Q84.8 — Other specified congenital malformations of integument (integument, specified type NEC), Q84.9 — Congenital malformation of integument, unspecified (integument), Q87.5 — Other congenital malformation syndromes with other skeletal changes (affecting multiple systems with skeletal changes NEC), Q93.2 — Chromosome replaced with ring, dicentric or isochromosome (chromosome, chromosomal, ring replacement), Q95.5 — Individual with autosomal fragile site (autosomes, fragile site), Q96.9 — Turner's syndrome, unspecified (chromosomes, chromosomal, sex, Turner's), Q97.1 — Female with more than three X chromosomes (chromosome, chromosomal, with more than three X chromosomes, female), Q97.8 — Other specified sex chromosome abnormalities, female phenotype (sex chromosomes NEC, female phenotype), Q97.9 — Sex chromosome abnormality, female phenotype, unspecified (chromosome, chromosomal, sex, female phenotype), Q98.4 — Klinefelter syndrome, unspecified (chromosomes, chromosomal, sex, Klinefelter's), Q98.6 — Male with structurally abnormal sex chromosome (chromosome, chromosomal, sex, structural male), Q98.8 — Other specified sex chromosome abnormalities, male phenotype (chromosome, chromosomal, sex, male phenotype, specified NEC), Q98.9 — Sex chromosome abnormality, male phenotype, unspecified (sex chromosomes NEC, male phenotype), +776 more

Contextual Map

Every relationship of Q89.9 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 23 — Factors Influencing Health Status and Other Contacts with Health Services[MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — 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. 1,258 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries (12)

  • Abnormal, abnormality, abnormalities, anatomical relationship[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Abnormal, abnormality, abnormalities, development, developmental[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Anomaly, anomalous (congenital) (unspecified type)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Anomaly, anomalous (congenital) (unspecified type), back[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Anomaly, anomalous (congenital) (unspecified type), organ[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Defect, defective[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Deformity[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Deformity, abdomen, congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • and 4 more

Nearest codes (12)

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 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 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. "Q89.9 — Congenital malformation, unspecified." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/q89.9-congenital-malformation-unspecified

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Congenital malformation, 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 Q89.9 in its code family, with their registry titles.

View all codes in the Q89 family