Medical records
ICD-10 code
ICD-10 codes are the standardized diagnosis codes attached to every billed medical encounter — a machine-readable layer of the chart that tells a litigation reader what each provider diagnosed, visit by visit.
The International Classification of Diseases, 10th revision, gives every diagnosis an alphanumeric code: S13.4 (cervical sprain), M51.26 (lumbar disc displacement), S06.0X0A (concussion without loss of consciousness, initial encounter). In injury cases the seventh character matters: A = initial encounter, D = subsequent, S = sequela — a coded assertion about where in the arc of care this visit sat. Codes appear on billing records, superbills, and in EHR problem lists.
Why it matters for legal readers
Codes are the chart’s index. Scanning the coded diagnoses across a records set reveals the diagnostic through-line faster than prose: when the cervical-strain code first appears, when radiculopathy joins it, whether the pre-incident chart carries the same code the claim is built on. Divergences are leads in both directions — a diagnosis coded for billing that the narrative never supports invites a defense argument about upcoding; a documented condition that never got coded suggests records or billing you haven’t seen.
One caution: codes are entered for reimbursement, by busy staff, from pick-lists. They’re evidence of what was recorded, not gospel about what was true — check the code against the note it rides on.
In the fact record
Because codes are structured, they extract cleanly: FactMarshal carries the coded diagnosis alongside each visit on the treatment timeline, so the diagnostic story and the narrative story can be read against each other.