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I34.81 ICD-10-CM Code: Nonrheumatic mitral (valve) annulus calcification

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

Coding at a Glance

Tabular directives
2 inclusion terms · 7 Excludes1 · 3 code-also instructions

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 306 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH MCC (MDC 05)
  • MS-DRG 307 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT 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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for I34.81 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on I34.81 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Nonrheumatic mitral (valve) annular calcification
  • Mitral (valve) annulus calcification NOS

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from I34

Code Also

Additional codes that may be required to fully describe the encounter.

  • Code also, if applicable:
  • nonrheumatic mitral (valve) insufficiency (I34.0)
  • nonrheumatic mitral (valve) stenosis (I34.2)

Coder workflow for I34.81

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

Before you code I34.81

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with I34.81. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in I34.81’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewI05.9, I05.8, I05.0, I08, Q23.2, Q23.9

Consider I34.81. Then review the Code Also note, and 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).

Official instructions as workflow

  • Excludes1 — check before selecting I34.81(7 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with I34.81: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareI05.9, I05.8, I05.0, I08, Q23.2, Q23.9

    See the official tabular notes · Guidelines I.A.12.a

  • Code Also — related condition(3 notes)

    Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

    ReviewI34.0, I34.2

    See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition I34.81 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewI05.9, I05.8, I05.0, I08, Q23.2, Q23.9

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

Nonrheumatic mitral (valve) annulus calcification is a billable ICD-10-CM diagnosis code (I34.81).

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 (4)

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 I34.81 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 Excludes1 note: I05 — Rheumatic mitral valve diseases (via I34.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: I08 — Multiple valve diseases (via I34.-).

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

Referenced by 2 Code Also instructions: I34.0 — Nonrheumatic mitral (valve) insufficiency, I34.2 — Nonrheumatic mitral (valve) stenosis.

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 306 (MDC 05), DRG 307 (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):CIR003 — Nonrheumatic and unspecified valve disorders (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 (Nonrheumatic and unspecified valve disorders).

I34.0 — Nonrheumatic mitral (valve) insufficiency, I34.1 — Nonrheumatic mitral (valve) prolapse, I34.2 — Nonrheumatic mitral (valve) stenosis, I34.8 — Other nonrheumatic mitral valve disorders, I34.89 — Other nonrheumatic mitral valve disorders, I34.9 — Nonrheumatic mitral valve disorder, unspecified, I35.0 — Nonrheumatic aortic (valve) stenosis, I35.1 — Nonrheumatic aortic (valve) insufficiency, I35.2 — Nonrheumatic aortic (valve) stenosis with insufficiency, I35.8 — Other nonrheumatic aortic valve disorders, I35.9 — Nonrheumatic aortic valve disorder, unspecified, I36.0 — Nonrheumatic tricuspid (valve) stenosis, I36.1 — Nonrheumatic tricuspid (valve) insufficiency, I36.2 — Nonrheumatic tricuspid (valve) stenosis with insufficiency, I36.8 — Other nonrheumatic tricuspid valve disorders, I36.9 — Nonrheumatic tricuspid valve disorder, unspecified, I37.0 — Nonrheumatic pulmonary valve stenosis, I37.1 — Nonrheumatic pulmonary valve insufficiency, I37.2 — Nonrheumatic pulmonary valve stenosis with insufficiency, I37.8 — Other nonrheumatic pulmonary valve disorders, +4 more

Same Index main term, other category

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

E83.59 — Other disorders of calcium metabolism (general), E83.820 — Generalized arterial calcification of infancy with unspecified genetic causality (arterial, generalized, of infancy), E83.821 — ENPP1 deficiency causing generalized arterial calcification of infancy (arterial, generalized, of infancy, with, ENPP1 deficiency), E83.823 — ABCC6 deficiency causing generalized arterial calcification of infancy (arterial, generalized, of infancy, with, ABCC6 deficiency), G23.8 — Other specified degenerative diseases of basal ganglia (basal ganglia), G93.89 — Other specified disorders of brain (cerebral), G96.198 — Other disorders of meninges, not elsewhere classified (meninges), H15.89 — Other disorders of sclera (sclera), I05.8 — Other rheumatic mitral valve diseases (mitral, annular, rheumatic), I31.1 — Chronic constrictive pericarditis (pericardium), I67.2 — Cerebral atherosclerosis (cerebral, artery), I70.0 — Atherosclerosis of aorta (aorta), I89.8 — Other specified noninfective disorders of lymphatic vessels and lymph nodes (lymph gland or node), J38.7 — Other diseases of larynx (larynx), J39.8 — Other specified diseases of upper respiratory tract (trachea), J94.8 — Other specified pleural conditions (pleura), J98.09 — Other diseases of bronchus, not elsewhere classified (bronchus), J98.4 — Other disorders of lung (lung), K00.4 — Disturbances in tooth formation (dentinal papilla), K04.2 — Pulp degeneration (pulpal), +38 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of I34.81 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 I34.81 with these 4 related codes in Claim Check

Hierarchy

Code Also

Referenced by Excludes1 notes

Referenced by Excludes2 notes

  • I08 — Multiple valve diseases[Excludes2](via I34.-): “multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

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

  • Calcification, mitral (valve), annular[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Calcification, mitral (valve), annular, nonrheumatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Calcification, mitral (valve), annulus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Calcification, mitral (valve), annulus, nonrheumatic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

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 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. "I34.81 — Nonrheumatic mitral (valve) annulus calcification." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/i34.81-nonrheumatic-mitral-valve-annulus-calcification

Change history

  • FY2023 — October 1, 2022
    Added to the code set
    Nonrheumatic mitral (valve) annulus calcification
    FY2023 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I34.81 in its code family, with their registry titles.

View all codes in the I34 family