Question 1

What is ICD-10 code Z87.51?

Accepted Answer

Z87.51 is the ICD-10-CM diagnosis code for personal history of pre-term labor. A patient who has previously experienced premature labor (delivery before 37 weeks of pregnancy) in a past pregnancy. Z87.51 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons with potential health hazards related to family and personal history and certain conditions influencing health status (z77-z99).

Z87.51 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.

This code documents a resolved obstetric history and should be used in addition to codes for current pregnancy complications if applicable.

Question 2

Is Z87.51 an HCC code?

Accepted Answer

No. Z87.51 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is Z87.51 billable?

Accepted Answer

Yes. Z87.51 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. Z87.51 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for Z87.51?

Accepted Answer

Z87.51 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards Z87.51 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting Z87.51?

Accepted Answer

This code documents a resolved obstetric history and should be used in addition to codes for current pregnancy complications if applicable Distinguish between personal history of preterm labor and current preterm labor, which requires different coding

Z87.51

Is Z87.51 an HCC code?

What This Code Means

Coding Tips

Excludes 1 — Do NOT code together

Code Hierarchy

Open Z87.51 in the Interactive Encoder