Is ICD-10-CM code R40 billable?

No, R40 (Somnolence, stupor and coma) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code R40 belong to?

R40 belongs to Chapter 18 of the ICD-10-CM tabular list: R00–R99 (Symptoms, Signs and Abnormal Clinical and Laboratory Findings).

R40Non-billable

Somnolence, stupor and coma

Symptoms, Signs and Abnormal Clinical and Laboratory Findings·Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)·category·FY 2026

Use a more specific code (4 billable, 1 non-billable)

R40.0Somnolence R40.1Stupor R40.2Comahas subcodes R40.3Persistent vegetative state R40.4Transient alteration of awareness

CH18 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

abnormal findings on antenatal screening of mother (O28.-)
certain conditions originating in the perinatal period (P04-P96)
signs and symptoms classified in the body system chapters
signs and symptoms of breast (N63, N64.5)

R40-R46 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

symptoms and signs constituting part of a pattern of mental disorder (F01-F99)

Instructional Notes

Excludes1(Not coded here. Use a different code.)

neonatal coma (P91.5)
somnolence, stupor and coma in diabetes (E08-E13)
somnolence, stupor and coma in hepatic failure (K72.-)
somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15)

Clinical Hierarchy

BillableHas subcodes

CH18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

R40-R46Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)

R40Somnolence, stupor and comaNot billable

R40.0SomnolenceBillable

R40.1StuporBillable

R40.2ComaSubcodes

R40.3Persistent vegetative stateBillable

R40.4Transient alteration of awarenessBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.