2026 ICD-10-CM Diagnosis Code Z85.831Personal history of malignant neoplasm of soft tissue
Z85.831 is a billable ICD-10-CM diagnosis code for personal history of malignant neoplasm of soft tissue. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 826 through 830, 843 through 845. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Personal history of malignant neoplasm.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z85.831.
Present on Admission (POA)Billing
Z85.831 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- History of Kaposi's sarcoma
- History of malignant mesothelioma
- History of malignant neoplasm of peritoneum
- History of rhabdomyosarcoma
- History of soft tissue sarcoma
- Intergroup rhabdomyosarcoma study post-surgical clinical group finding
- Intergroup rhabdomyosarcoma study post-surgical clinical group IA: localized tumor, confined to site of origin, completely resected
- Intergroup rhabdomyosarcoma study post-surgical clinical group IB: localized tumor, infiltrating beyond site of origin, completely resected
- Intergroup rhabdomyosarcoma study post-surgical clinical group IIA: localized tumor, gross total resection, but with microscopic residual disease
- Intergroup rhabdomyosarcoma study post-surgical clinical group IIB: Locally extensive tumor , completely resected
- Intergroup rhabdomyosarcoma study post-surgical clinical group IIC: Locally extensive tumor , gross total resection, but microscopic residual disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 2 Excludes
- personal history of malignant neoplasm of skin Z85.82
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- History
- personal (of) - See Also: History, family (of);
- malignant neoplasm (of) - Z85.9
- soft tissue - Z85.831
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- History
- personal (of)
- malignant neoplasm (of)
- soft tissue
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Cancer
Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should.
The full article covers:
- What is cancer?
- What are the types of cancer?
- How does cancer develop?
- What are the symptoms of cancer?
- How is cancer diagnosed?
- What are the treatments for cancer?
- Can cancer be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Z85.831 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z85.831Overview
Is Z85.831 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report personal history of malignant neoplasm of soft tissue on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does Z85.831 group to?
On inpatient claims, personal history of malignant neoplasm of soft tissue maps to MS-DRG 826, 827, 828, 829, 830, 843, 844, 845, with relative weights from 0.8516 to 4.6778 depending on complications. Higher weights mean higher Medicare reimbursement.
Can Z85.831 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because personal history of malignant neoplasm of soft tissue describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z85.831 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for personal history of malignant neoplasm of soft tissue on inpatient claims.
What is the ICD-9 equivalent of Z85.831?
Under the General Equivalence Mappings, personal history of malignant neoplasm of soft tissue converts to ICD-9-CM V10.89 (hx of malignancy NEC). The mapping is approximate, so confirm the match fits the documentation.
