Z85.238 ICD-10-CM Code: Personal history of other malignant neoplasm of thymus
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Factors influencing health status and contact with health services (Z00-Z99) / Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
Z85.238
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidancePersonal history of other malignant neoplasm of thymus
A patient who previously had a cancer of the thymus gland that was not a carcinoid tumor.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
Basket needed
Code Book Path
Inclusion Terms
Official- Conditions classifiable to C37
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for Z85.238 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Z85.238 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for Z85.238 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Z85.238 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Z85.238 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Z85.238 in this effective period.
Buddy Documentation Tip
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 Z85.238 an HCC code?
No. Z85.238 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
Z85.238 is the ICD-10-CM diagnosis code for personal history of other malignant neoplasm of thymus. A patient who previously had a cancer of the thymus gland that was not a carcinoid tumor. Z85.238 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).
Z85.238 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.
Use this code only when the thymic cancer is not specifically a carcinoid tumor.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z85.238 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the thymic cancer is not specifically a carcinoid tumor.
- •Review pathology reports to confirm the histological type before coding.