ICD-10 Code for Suicidal Ideation: R45.851

Suicide attempt and personal history of suicidal behavior are coded elsewhere. The Alphabetic Index lists "Suicide, suicidal (attempted)" at T14.91, and "History, personal, suicide attempt" at Z91.51. T14.91 requires a seventh character, and the FY2027 tabular list provides T14.91XA, T14.91XD and T14.91XS.

Not for the same condition. R45.85 carries an Excludes1 note for suicide attempt (T14.91). The Official Guidelines say an Excludes1 note means the excluded code should never be used at the same time as the code above the note, with one exception: when the two conditions are unrelated to each other. If it is not clear whether the conditions are related, the guidelines say to query the provider (Section I.A.12.a).

The same logic separates the active record from the past. A client who is currently having suicidal ideation has R45.851 documented. A client who attempted suicide at some earlier time and has no current treatment for it can have a personal history code, which the Guidelines describe as a past condition that no longer exists and is not receiving any treatment, but that has the potential for recurrence and may require continued monitoring (Section I.C.21.c.4). Which applies is the clinician's documented finding.

The Official Guidelines give two general rules. Signs and symptoms associated routinely with a disease process should not be assigned as additional codes, unless the classification instructs otherwise (Section I.B.5). Additional signs and symptoms that may not be associated routinely with a disease process should be coded when present (Section I.B.6). The tabular list adds an Excludes2 note at the head of R40 to R46 for symptoms and signs constituting part of a pattern of mental disorder (F01 to F99).

The FY2027 guidelines do not address suicidal ideation by name, so this is a coding judgment to make from the clinician's documentation and the payer's guidance. The code only records that ideation was documented. It carries no information about severity, intent, plan or timing, so those belong in the note.

The Guidelines say codes for symptoms and signs are acceptable when a related definitive diagnosis has not been established by the provider (Section I.B.4), and that in outpatient care the first-listed diagnosis may be a symptom when a diagnosis has not been established (Section IV.G). When a diagnosis such as a mood disorder is established and documented, that diagnosis is the one to build the claim around. Confirm payer rules before billing.

The ICD-10-CM code says why the client is being seen; the CPT code says what service was provided. A session that addresses suicidal ideation is reported with the psychotherapy code that matches the time and service, such as CPT 90837, and a crisis session has its own codes. See CPT 90839 for psychotherapy for crisis. The diagnosis must be supported in the note for every date of service.