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ICD-10-CM 2027 diagnosis code

I16.0Hypertensive urgency

✓ Billable / specific

I16.0 is a valid, billable ICD-10-CM code for hypertensive urgency. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I16.0

I16.0 is the ICD-10-CM diagnosis code for hypertensive urgency. It belongs to category I16 (hypertensive crisis), 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 I16 (hypertensive crisis), I16.0 is specifically for hypertensive urgency. Related codes cover emergency (I16.1) and unspecified (I16.9).

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 was added in FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 401.9 (unspecified essential hypertension).

Notes that apply from higher levels

Instructions written at a parent level also apply to I16.0.

› From I16 Hypertensive crisis
Code also
  • any identified hypertensive disease (I10-I15, I1A)

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

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to I16.0.

Codes whose notes reference I16.0

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 →
  • 401.9Unspecified essential 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
  • FY2017 (effective 10/1/2016): Added
  • No changes since FY2017.

Common questions about I16.0

Is I16.0 billable?

Yes. I16.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I16.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I16.0 as a principal diagnosis.

Is I16.0 a CC or MCC?

No. I16.0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I16.0 group to?

I16.0 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 I16.0?

The CMS General Equivalence Mappings map I16.0 to ICD-9-CM 401.9.