2026 ICD-10-CM Diagnosis Code Z85.9Personal history of malignant neoplasm, unspecified
Z85.9 is a billable ICD-10-CM diagnosis code for personal history of malignant neoplasm, unspecified. 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 Z85.9.
Present on Admission (POA)Billing
Z85.9 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.
- H/O: carcinoma
- H/O: malignant neoplasm
- History of cancer of unknown primary site
- History of choriocarcinoma
- History of disseminated malignant neoplasm
- History of germ cell tumor
- History of malignant neoplasm of ovary
- History of malignant neoplasm of uterine adnexa
- History of metastatic cancer
- History of metastatic neoplasm to ovary
- History of neoplasm
- History of neuroendocrine malignant neoplasm
- History of non central nervous system primitive neuroectodermal tumor
- History of primitive neuroectodermal tumor
- History of squamous cell carcinoma
- History of well-differentiated neuroendocrine tumor
- Sampling of vagina for Papanicolaou smear after hysterectomy for malignant disease done
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
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
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- History
- personal (of)
- malignant neoplasm (of)
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 Z85.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z85.9Overview
Is Z85.9 (Personal history of malignant neoplasm) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report personal history of malignant neoplasm, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does Z85.9 group to?
On inpatient claims, personal history of malignant neoplasm, unspecified 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 Z85.9 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because personal history of malignant neoplasm, unspecified describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z85.9 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, unspecified on inpatient claims.
What is the ICD-9 equivalent of Z85.9?
Under the General Equivalence Mappings, personal history of malignant neoplasm, unspecified converts to ICD-9-CM V10.90 (hx malig neoplasm NOS). The mapping is a direct match.
