Encounter for other aftercare and medical care
In Encounters for other specific health care (Z40-Z53), chapter 21: Factors Influencing Health Status and Contact with Health Services
8 billable codes under Z51: none are a CC or MCC; none map to an HCC.
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Instructional notes
Excludes1: not coded here, use a different code
- follow-up examination after treatment (Z08-Z09)
Code also: add a code for this too, order depends on the encounter
- condition requiring care
Also applies, from Encounters for other specific health care (Z40-Z53)
These notes sit on Z40-Z53 and apply to every code under it, including Z51.
Includes: conditions that are coded here
- Categories Z40-Z53 are intended for use to indicate a reason for care. They may be used for patients who have already been treated for a disease or injury, but who are receiving aftercare or prophylactic care, or care to consolidate the treatment, or to deal with a residual state
Excludes2: not included here, code separately if applicable
- follow-up examination for medical surveillance after treatment (Z08-Z09)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers when and how to use Z codes (Z00-Z99) for encounters and supplementary information, including contact, status, history, screening, aftercare, exams, and social determinants of health.
All codes under Z51
Z51 can't be used on a claim. Pick a billable code below; grey headings group them.
- Z51.0Encounter for antineoplastic radiation therapy
- Z51.1Encounter for antineoplastic chemotherapy and immunotherapy
- Z51.11Encounter for antineoplastic chemotherapy
- Z51.12Encounter for antineoplastic immunotherapy
- Z51.5Encounter for palliative care
- Z51.6Encounter for desensitization to allergens
- Z51.8Encounter for other specified aftercare
- Z51.81Encounter for therapeutic drug level monitoring
- Z51.89Encounter for other specified aftercare
- Z51.AEncounter for sepsis aftercare
Z51 MS-DRGs
As the principal diagnosis, the billable codes under Z51 group to these 15 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 826 Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC (3 of 8 codes)
- DRG 827 Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with CC (3 of 8 codes)
- DRG 828 Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures without CC/MCC (3 of 8 codes)
- DRG 829 Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Other Procedures with CC/MCC (3 of 8 codes)
- DRG 830 Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Other Procedures without CC/MCC (3 of 8 codes)
- DRG 949 Aftercare with CC/MCC (3 of 8 codes)
- DRG 950 Aftercare without CC/MCC (3 of 8 codes)
- DRG 837 Chemotherapy with Acute Leukemia as Secondary Diagnosis or with High Dose Chemotherapy Agent with MCC (2 of 8 codes)
- DRG 838 Chemotherapy with Acute Leukemia as Secondary Diagnosis with CC or High Dose Chemotherapy Agent (2 of 8 codes)
- DRG 839 Chemotherapy with Acute Leukemia as Secondary Diagnosis without CC/MCC (2 of 8 codes)
- DRG 846 Chemotherapy without Acute Leukemia as Secondary Diagnosis with MCC (2 of 8 codes)
- DRG 847 Chemotherapy without Acute Leukemia as Secondary Diagnosis with CC (2 of 8 codes)
- DRG 848 Chemotherapy without Acute Leukemia as Secondary Diagnosis without CC/MCC (2 of 8 codes)
- DRG 951 Other Factors Influencing Health Status (2 of 8 codes)
- DRG 849 Radiotherapy (1 of 8 codes)
Other codes that refer to Z51
Notes on these codes point to Z51.
Code history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015.
- FY2017: Title changed. It was: Encounter for other aftercare.