2026 ICD-10-CM Diagnosis Code I34.81Nonrheumatic mitral (valve) annulus calcification
ICD-10-CM Codes›I00–I99›I30-I5A›I34
- Billable — Valid for Submission
- Chronic Condition
I34.81 is a billable ICD-10-CM diagnosis code for nonrheumatic mitral (valve) annulus calcification. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 306 through 307. Coders also document this condition as abnormality of mitral valve annulus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonrheumatic and unspecified valve disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormality of mitral valve annulus
- Calcification of mitral valve
- Mitral valve annular calcification
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Nonrheumatic mitral (valve) annular calcification
- Mitral (valve) annulus calcification NOS
Code Also
- , if applicable:
- nonrheumatic mitral valve insufficiency I34.0
- nonrheumatic mitral valve stenosis I34.2
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- annular - I34.81
- nonrheumatic - I34.81
- annulus - I34.81
- nonrheumatic - I34.81
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Calcification
- mitral (valve)
- annular
- Calcification
- mitral (valve)
- annular
- nonrheumatic
- Calcification
- mitral (valve)
- annulus
- Calcification
- mitral (valve)
- annulus
- nonrheumatic
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Heart Valve Diseases
Heart valve disease happens when one or more of your heart valves don't work well.
The full article covers:
- What are heart valve diseases?
- What are the types of heart valve diseases?
- What causes heart valve diseases?
- Who is more likely to develop heart valve diseases?
- What are the symptoms of heart valve diseases?
- What other problems can heart valve diseases cause?
- How is heart valve disease diagnosed?
- What are the treatments for heart valve diseases?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement I34.81 replaces the following previously assigned code(s):
- I34.8 - Other nonrheumatic mitral valve disorders
Questions About I34.81Overview
Is I34.81 (Other nonrheumatic mitral valve disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report nonrheumatic mitral (valve) annulus calcification on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I34.81 group to?
When nonrheumatic mitral (valve) annulus calcification is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9132 to 1.5758 depending on complications. Higher weights mean higher Medicare reimbursement.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
