ICD-10-CM 2027 diagnosis code
I36.1Nonrheumatic tricuspid (valve) insufficiency
I36.1 is a valid, billable ICD-10-CM code for nonrheumatic tricuspid (valve) insufficiency. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About I36.1
I36.1 is the ICD-10-CM diagnosis code for nonrheumatic tricuspid (valve) insufficiency. It belongs to category I36 (nonrheumatic tricuspid valve disorders), block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within I36 (nonrheumatic tricuspid valve disorders), I36.1 is specifically for nonrheumatic tricuspid (valve) insufficiency. Related codes cover nonrheumatic tricuspid (valve) stenosis (I36.0), nonrheumatic tricuspid (valve) stenosis with insufficiency (I36.2), other nonrheumatic tricuspid valve disorders (I36.8) and nonrheumatic tricuspid valve disorder, unspecified (I36.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 424.2 (tricuspid valve disorders, specified as nonrheumatic).
Coding notes
- Nonrheumatic tricuspid (valve) incompetence
- Nonrheumatic tricuspid (valve) regurgitation
Notes that apply from higher levels
Instructions written at a parent level also apply to I36.1.
Broader instructions also apply from Chapter 9: Diseases of the circulatory system.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to I36.1.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 05 · Diseases and Disorders of the Circulatory System
ICD-9-CM equivalent
Converter →- 424.2Tricuspid valve disorders, specified as nonrheumaticapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about I36.1
Is I36.1 billable?
- Yes. I36.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I36.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I36.1 as a principal diagnosis.
Is I36.1 a CC or MCC?
- No. I36.1 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does I36.1 group to?
- I36.1 is used in the MS-DRG v44.0 logic for MS-DRG 306 (Cardiac Congenital and Valvular Disorders with MCC) and MS-DRG 307 (Cardiac Congenital and Valvular Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for I36.1?
- The CMS General Equivalence Mappings map I36.1 to ICD-9-CM 424.2.