N18.30
BillableChronic kidney disease, stage 3 unspecified
HCC Category Mapping
V28HCC 329 — Pressure Ulcer of Skin with Necrosis Through to Muscle, Tendon, or Bone
1.071V24HCC 138 — Chronic Kidney Disease, Moderate (Stage 3)
0.000ESRDHCC 138 — Chronic Kidney Disease, Moderate (Stage 3)
0.000What This Code Means
Stage 3 chronic kidney disease with moderately decreased kidney function, but the specific substage (3a or 3b) is not specified.
Coding Tips
- •This unspecified code should only be used when the provider documentation does not differentiate between stage 3a (GFR 45-59) and 3b (GFR 30-44)
- •Query the provider or review lab values to determine if stage 3a or 3b can be assigned for greater specificity
Clinical Significance
Stage 3 chronic kidney disease unspecified represents moderate kidney function decline (GFR 30-59) without substage specification, indicating need for nephrology management and cardiovascular risk monitoring. This diagnosis has varying HCC impacts across models and requires careful substage documentation for optimal coding.
Documentation Requirements
- ✓Chronic kidney disease stage 3 clearly documented
- ✓GFR values in the 30-59 range supporting stage 3
- ✓Documentation of why substage 3a or 3b is not specified
- ✓Underlying etiology of CKD if known
- ✓Current management plan including nephrology involvement
- ✓Cardiovascular risk assessment and management
- ✓Laboratory monitoring schedule documented
Commonly Confused Codes
Code Hierarchy
└N18Chronic kidney disease (CKD)└N18.3Chronic kidney disease, stage 3 (moderate)└N18.30Chronic kidney disease, stage 3 unspecified
└N18.30Chronic kidney disease, stage 3 unspecified