ICD-10 code for radiotherapy session

The ICD-10-CM code for radiotherapy session is Z51.0 (Encounter for antineoplastic radiation therapy).

Within Z51 (encounter for other aftercare and medical care), Z51.0 is specifically for encounter for antineoplastic radiation therapy. Related codes cover antineoplastic chemotherapy and immunotherapy (Z51.1), palliative care (Z51.5), desensitization to allergens (Z51.6), other specified aftercare (Z51.8) and sepsis aftercare (Z51.A).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 826 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC, relative weight 4.7581), DRG 827 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with CC, relative weight 2.3896), DRG 828 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures without CC/MCC, relative weight 1.6955), DRG 829 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Other Procedures with CC/MCC, relative weight 3.1281), DRG 830 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Other Procedures without CC/MCC, relative weight 1.4859) and DRG 849 (Radiotherapy, relative weight 2.5857), in MDC 17 (Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.