ICD-10 Code for Therapy

The ICD-10-CM 2027 alphabetic index lists therapy with the subterms below. More specific codes depend on the details documented, as listed in the official index (18 codes, 18 billable).

Index entries for Therapy

drug, long-term (current) (prophylactic)
- agents affecting estrogen receptors and estrogen levels NEC – Z79.818
- anastrozole (Arimidex) – Z79.811
- antibiotics – Z79.2
  - short-term use - omit code
- anticoagulants – Z79.01
- anti-inflammatory – Z79.1
- antiplatelet – Z79.02
- antithrombotics – Z79.02
- aromatase inhibitors – Z79.811
- aspirin – Z79.82
- birth control pill or patch – Z79.3
- bisphosphonates – Z79.83
- contraceptive, oral – Z79.3
- drug, specified NEC – Z79.899
- estrogen receptor downregulators – Z79.818
- Evista – Z79.810
- exemestane (Aromasin) – Z79.811
- Fareston – Z79.810
- fulvestrant (Faslodex) – Z79.818
- gonadotropin-releasing hormone (GnRH) – Z79.818
- goserelin acetate (Zoladex) – Z79.818
- hormone replacement – Z79.890
- insulin – Z79.4
- letrozole (Femara) – Z79.811
- leuprolide acetate (leuprorelin) (Lupron) – Z79.818
- megestrol acetate (Megace) – Z79.818
- methadone
  - for pain management – Z79.891
  - maintenance therapy – F11.20
- Nolvadex – Z79.810
- opiate analgesic – Z79.891
- oral antidiabetic – Z79.84
- oral contraceptive – Z79.3
- oral hypoglycemic – Z79.84
- raloxifene (Evista) – Z79.810
- selective estrogen receptor modulators (SERMs) – Z79.810
- short term - omit code
- steroids
  - inhaled – Z79.51
  - systemic – Z79.52
- tamoxifen (Nolvadex) – Z79.810
- toremifene (Fareston) – Z79.810

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.