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ICD-10-CM I12.9: Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

I12.9 is the billable ICD-10-CM code for hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease, in category I12 (Hypertensive chronic kidney disease) of the Hypertensive diseases section. As a principal diagnosis it groups to MS-DRG 682 Renal Failure with MCC, MS-DRG 683 Renal Failure with CC, MS-DRG 684 Renal Failure without CC/MCC (MDC 11 MDC 11: Diseases and Disorders of the Kidney and Urinary Tract). 26 LCD billing and coding articles list it as covered.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
I12.9
billable FY2027 ICD-10-CM code
Category
I12 Hypertensive chronic kidney disease
Chapter
9: Diseases of the circulatory system (I00-I99)
CC/MCC (MS-DRG v44)
Neither
CMS-HCC V28
Not mapped
POA reporting
Required

Tabular list notes for I12.9

The tabular list has no notes on I12.9 itself; the notes below apply from its parent headings.

Inherited from I12 (Hypertensive chronic kidney disease)

Includes
  • any condition in N18 and N26 - due to hypertension
  • arteriosclerosis of kidney
  • arteriosclerotic nephritis (chronic) (interstitial)
  • hypertensive nephropathy
  • nephrosclerosis
Excludes1 (never coded together)
  • hypertension due to kidney disease (I15.0, I15.1)
  • renovascular hypertension (I15.0)
  • secondary hypertension (I15.-)
Excludes2 (not part of this condition, may be coded together)
  • acute kidney failure (N17.-)

MS-DRG grouping when I12.9 is the principal diagnosis

MS-DRG v44 groups for I12.9 as principal diagnosis
MDCMS-DRGs
11 MDC 11: Diseases and Disorders of the Kidney and Urinary Tract682683684

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for I12.9 shows the full grouping logic.

CC/MCC status and inpatient edits

I12.9 is neither a CC nor an MCC under MS-DRG v44, so as a secondary diagnosis it does not raise the MS-DRG severity level. Check I12.9 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

I12.9 does not map to a payment HCC in the PY2027 CMS-HCC V28 model, so on its own it does not change a Medicare Advantage risk score.

LCD billing and coding articles that list I12.9

26 current Medicare billing and coding articles list I12.9 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM I12.9 mean?

I12.9 means hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease. It is one of 2 billable codes under I12, hypertensive chronic kidney disease.

What can't be coded with I12.9?

Excludes1 at I12: hypertension due to kidney disease (I15.0, I15.1); renovascular hypertension (I15.0); secondary hypertension (I15.-). These are never reported together with I12.9.

Which MS-DRG does I12.9 group to?

As the principal diagnosis, I12.9 groups to MS-DRG 682 Renal Failure with MCC, MS-DRG 683 Renal Failure with CC, MS-DRG 684 Renal Failure without CC/MCC (MDC 11 MDC 11: Diseases and Disorders of the Kidney and Urinary Tract) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.