M1023 — Other Diagnoses
Response options, how to score it, and the error that most often sends the record back. Cited to Ch. 3, Item M1023.
How to score it
Enter each comorbid ICD-10-CM diagnosis code (highest specificity, no surgical/procedure codes) that is either actively addressed in the plan of care or could affect the patient's response to treatment and rehabilitative prognosis, even if it isn't the treatment focus. Order the rows by how much each diagnosis affects the patient's health and need for home health care — not by how well-controlled its symptoms are. Unlike M1021 (Primary Diagnosis), V/W/X/Y external-cause codes are allowed here. Each row's Column 2 also carries a 0–4 symptom-control rating (0 = asymptomatic, 4 = poorly controlled with a history of rehospitalization); dash is not a valid response.
The common error
Sequencing other diagnoses by symptom-control severity instead of clinical impact. CMS's own example: a diabetes diagnosis that is merely “controlled with difficulty” must still be listed above a fungal toenail infection that is “poorly controlled,” because diabetes drives more of the patient's home health care need — the symptom-control column and the row sequencing are separate and must not be conflated.
Source: OASIS-E2 Guidance Manual — Ch. 3, Item M1023. Verified 2026-04-26.
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