P07.23
BillableExtreme immaturity of newborn, gestational age 24 completed weeks
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is P07.23 an HCC code?
No. P07.23 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
P07.23 is the ICD-10-CM diagnosis code for extreme immaturity of newborn, gestational age 24 completed weeks. A newborn born at 24 completed weeks of pregnancy, still considered extremely premature with high risk for serious complications affecting multiple organ systems. P07.23 sits in the ICD-10-CM chapter for certain conditions originating in the perinatal period (p00-p96), within the section covering disorders of newborn related to length of gestation and fetal growth (p05-p08).
P07.23 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.
Ensure documentation specifies 24 completed weeks to distinguish from adjacent gestational age categories.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for P07.23 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation specifies 24 completed weeks to distinguish from adjacent gestational age categories
- •Code any associated conditions such as intraventricular hemorrhage, necrotizing enterocolitis, or chronic lung disease separately