I12.9 ICD-10-CM Code: Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
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Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Hypertensive diseases (I10-I1A)
I12.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceHypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease
High blood pressure that has caused kidney disease in stages 1 through 4, where the kidneys are damaged but still functioning at some level.
Buddy Insight
Hypertensive chronic kidney disease with stages 1-4 or unspecified CKD captures the common comorbidity of hypertension and earlier-stage chronic kidney disease.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
MappedHCC 187
RAF 0.0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Hypertensive chronic kidney disease NOS
- Hypertensive renal disease NOS
Excludes 2
Official- acute kidney failure (N17.-)
Related Child Codes
Includes
Official- any condition in N18 and N26 - due to hypertension
- arteriosclerosis of kidney
- arteriosclerotic nephritis (chronic) (interstitial)
- hypertensive nephropathy
- nephrosclerosis
Excludes 1
Official- hypertension due to kidney disease (I15.0, I15.1)
- renovascular hypertension (I15.0)
- secondary hypertension (I15.-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for I12.9 in this effective period.
Use Additional
Official- code to identify the stage of chronic kidney disease (N18.1-N18.4, N18.9)
Code Also
OfficialICD-10-CM does not list Code Also instructions for I12.9 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is I12.9 an HCC code?
No. I12.9 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
Work I12.9 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for I12.9
For I12.9to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed I12.9 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
I12.9 is the ICD-10-CM diagnosis code for hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease. High blood pressure that has caused kidney disease in stages 1 through 4, where the kidneys are damaged but still functioning at some level. I12.9 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering hypertensive diseases (i10-i1a).
I12.9 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Maps to RxHCC 187 (Hypertension) with a RAF weight of 0.000 in the prescription drug model. Does NOT map to CMS-HCC v28, v24, or ESRD models directly. However, the additional CKD stage code (N18.3 for stage 3 or N18.4 for stage 4) may map to its own HCC category. Always ensure the CKD stage is coded separately to capture any additional risk adjustment value. The transition from stage 4 to stage 5 CKD triggers a significant RAF increase via I12.0.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for I12.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use I12.9 for stages 1-4 CKD or when the CKD stage is not specified; do not use for stage 5 (use I12.0 instead)
- •Ensure documentation establishes the causal relationship between hypertension and the chronic kidney disease
Clinical Significance
Hypertensive chronic kidney disease with stages 1-4 or unspecified CKD captures the common comorbidity of hypertension and earlier-stage chronic kidney disease. ICD-10-CM guidelines assume a causal relationship between hypertension and CKD when they coexist. While this code itself maps only to the RxHCC model, the additional CKD stage code may contribute independently to risk adjustment.
Documentation Requirements
- ✓Documented diagnosis of hypertension
- ✓Documented chronic kidney disease (stages 1-4 or unspecified)
- ✓An additional code from N18.1-N18.4 or N18.9 to identify the CKD stage
- ✓Current estimated glomerular filtration rate (eGFR)
- ✓Current treatment regimen for both conditions
- ✓Documentation of CKD stage based on eGFR values
- ✓Note: If CKD stage is not specified, use N18.9 as the additional code
Commonly Confused Codes
- •I12.0: Hypertensive CKD with stage 5/ESRD (use for advanced kidney disease)
- •I10: Essential hypertension alone (do NOT use when CKD coexists: must use I12.9)
- •I13.10: Hypertensive heart and CKD without heart failure (use when heart disease is also present)
- •N18.1-N18.4: CKD stage 1-4 codes (additional codes to assign WITH I12.9, not instead of)
- •N17.x: Acute kidney failure/injury (different condition; I12.9 is for chronic kidney disease only)