Z85.850 ICD-10-CM Code: Personal history of malignant neoplasm of thyroid
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 826 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH MAJOR O.R. PROCEDURES WITH MCC (MDC 17)
- MS-DRG 827 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH MAJOR O.R. PROCEDURES WITH CC (MDC 17)
- MS-DRG 828 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH MAJOR O.R. PROCEDURES WITHOUT CC/MCC (MDC 17)
- MS-DRG 829 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH OTHER PROCEDURES WITH CC/MCC (MDC 17)
- MS-DRG 830 — MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASMS WITH OTHER PROCEDURES WITHOUT CC/MCC (MDC 17)
- MS-DRG 843 — OTHER MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASTIC DIAGNOSES WITH MCC (MDC 17)
- MS-DRG 844 — OTHER MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASTIC DIAGNOSES WITH CC (MDC 17)
- MS-DRG 845 — OTHER MYELOPROLIFERATIVE DISORDERS OR POORLY DIFFERENTIATED NEOPLASTIC DIAGNOSES WITHOUT CC/MCC (MDC 17)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for Z85.850 in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- personal history of benign neoplasm (Z86.01-)
- personal history of carcinoma-in-situ (Z86.00-)
Code First
Underlying conditions that must be sequenced before this code.
- any follow-up examination after treatment of malignant neoplasm (Z08)
Code Also
Additional codes that may be required to fully describe the encounter.
- any follow-up examination (Z08-Z09)
Use Additional Code
Supplementary codes the tabular list directs you to add.
- Use additional code to identify:
- alcohol use and dependence (F10.-)
- exposure to environmental tobacco smoke (Z77.22)
- history of tobacco dependence (Z87.891)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to Z85.850 in its code family, with their registry titles.
- Z85.83 — Personal history of malignant neoplasm of bone and soft tissue
- Z85.830 — Personal history of malignant neoplasm of bone
- Z85.831 — Personal history of malignant neoplasm of soft tissue
- Z85.84 — Personal history of malignant neoplasm of eye and nervous tissue
- Z85.840 — Personal history of malignant neoplasm of eye
- Z85.841 — Personal history of malignant neoplasm of brain
- Z85.848 — Personal history of malignant neoplasm of other parts of nervous tissue
- Z85.85 — Personal history of malignant neoplasm of endocrine glands
- Z85.858 — Personal history of malignant neoplasm of other endocrine glands
- Z85.89 — Personal history of malignant neoplasm of other organs and systems
Indexed Clinical Terms (1)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- History, personal (of), malignant neoplasm (of), thyroid