Z90 ICD-10-CM Code: Acquired absence of organs, not elsewhere classified
Z90 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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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)
Z90
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceAcquired absence of organs, not elsewhere classified
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for Z90. Check the code and parent instructions in the Code Book.
Excludes 2
Official- postprocedural absence of endocrine glands (E89.-)
Related Codes
Includes
Official- postprocedural or post-traumatic loss of body part NEC
Excludes 1
Official- congenital absence - see Alphabetical Index
Code First
OfficialNo Code First sequencing instructions are included in this display for Z90. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for Z90. Check the code and parent instructions in the Code Book.
Code Also
Official- any follow-up examination (Z08-Z09)Inherited from Z77-Z99
Served edition: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- Z90
- Description
- Acquired absence of organs, not elsewhere classified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
Z90 is the ICD-10-CM diagnosis code for acquired absence of organs, not elsewhere classified. Z90 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).
Header codes like Z90 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for Z90 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Includes
- postprocedural or post-traumatic loss of body part NEC
Excludes 1, Do NOT code together
- congenital absence - see Alphabetical Index
Excludes 2, Not included here, may code separately
- postprocedural absence of endocrine glands (E89.-)