2026 ICD-10-CM Diagnosis Code Z85.520Personal history of malignant carcinoid tumor of kidney
Z85.520 is a billable ICD-10-CM diagnosis code for personal history of malignant carcinoid tumor of kidney. 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. Coders also document this condition as history of well-differentiated neuroendocrine tumor. 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 Z85.520.
Present on Admission (POA)Billing
Z85.520 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 well-differentiated neuroendocrine tumor
- History of well-differentiated neuroendocrine tumor of kidney
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Conditions classifiable to C7A.093
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
- kidney NEC - Z85.528
- carcinoid - Z85.520
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- History
- personal (of)
- malignant neoplasm (of)
- kidney NEC
- carcinoid
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Carcinoid Tumors
Carcinoid tumors are rare, slow-growing cancers. They usually start in the lining of the digestive tract or in the lungs. They grow slowly and don't produce symptoms in the early stages. As a result, the average age of people diagnosed with digestive or lung carcinoids is about 60.
Read the full article at MedlinePlus
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Convert Z85.520 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z85.520Overview
Is Z85.520 (Personal history of malignant neoplasm of kidney) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report personal history of malignant carcinoid tumor of kidney on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does Z85.520 group to?
On inpatient claims, personal history of malignant carcinoid tumor of kidney 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 Z85.520 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because personal history of malignant carcinoid tumor of kidney describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z85.520 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 carcinoid tumor of kidney on inpatient claims.
What is the ICD-9 equivalent of Z85.520?
Under the General Equivalence Mappings, personal history of malignant carcinoid tumor of kidney converts to ICD-9-CM V10.91 (hx malig neuroendo tumor). The mapping is approximate, so confirm the match fits the documentation.
