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ICD-10-CM 2027 diagnosis code

I15.2Hypertension secondary to endocrine disorders

✓ Billable / specific

I15.2 is a valid, billable ICD-10-CM code for hypertension secondary to endocrine disorders. 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 I15.2

I15.2 is the ICD-10-CM diagnosis code for hypertension secondary to endocrine disorders. It belongs to category I15 (secondary hypertension), block I10-I1A (hypertensive diseases) 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 I15 (secondary hypertension), I15.2 is specifically for hypertension secondary to endocrine disorders. Related codes cover renovascular hypertension (I15.0), hypertension secondary to other renal disorders (I15.1), other secondary hypertension (I15.8) and unspecified (I15.9).

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 304 (Hypertension with MCC, relative weight 1.2011) and DRG 305 (Hypertension without MCC, relative weight 0.7581), 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 405.99 (other unspecified secondary hypertension).

Notes that apply from higher levels

Instructions written at a parent level also apply to I15.2.

› From I15 Secondary hypertension
Excludes1
  • postprocedural hypertension (I97.3)
Excludes2
  • secondary hypertension involving vessels of brain (I60-I69)
  • secondary hypertension involving vessels of eye (H35.0-)
Code also
  • underlying condition

Broader instructions also apply from I10-I1A Hypertensive diseases and Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to I15.2.

Codes whose notes reference I15.2

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 →
  • 405.99Other unspecified secondary hypertensionapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about I15.2

Is I15.2 billable?

Yes. I15.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I15.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I15.2 as a principal diagnosis.

Is I15.2 a CC or MCC?

No. I15.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I15.2 group to?

I15.2 is used in the MS-DRG v44.0 logic for MS-DRG 304 (Hypertension with MCC) and MS-DRG 305 (Hypertension 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 I15.2?

The CMS General Equivalence Mappings map I15.2 to ICD-9-CM 405.99.