ICD-10-CM Codes
R00-R99
R40-R46
R40-
2023 ICD-10-CM Diagnosis Code R40

2023 ICD-10-CM Diagnosis Code R40

Somnolence, stupor and coma

2016

2017

2018

2019

2020

2021

2022

2023

Non-Billable/Non-Specific Code

R40 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2023 edition of ICD-10-CM R40 became effective on October 1, 2022.
This is the American ICD-10-CM version of R40 - other international versions of ICD-10 R40 may differ.

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as R40. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

neonatal coma (
ICD-10-CM Diagnosis Code P91.5
Neonatal coma
P91.5
)
somnolence, stupor and coma in diabetes (E08-E13
ICD-10-CM Range E08-E13
Diabetes mellitus
- E08 Diabetes mellitus due to underlying cond...
- E09 Drug or chemical induced diabetes mellit...
- E10 Type 1 diabetes mellitus
- E11 Type 2 diabetes mellitus
- E13 Other specified diabetes mellitus
)
somnolence, stupor and coma in hepatic failure (
ICD-10-CM Diagnosis Code K72
- K72 Hepatic failure, not elsewhere classified
  - K72.0 Acute and subacute hepatic failure
    - K72.00 Acute and subacute hepatic failure without co...
    - K72.01 …… with coma
  - K72.1 Chronic hepatic failure
    - K72.10 …… without coma
    - K72.11 …… with coma
  - K72.9 Hepatic failure, unspecified
    - K72.90 …… without coma
    - K72.91 …… with coma
K72.-
)
somnolence, stupor and coma in hypoglycemia (nondiabetic) (
ICD-10-CM Diagnosis Code E15
Nondiabetic hypoglycemic coma
Includes
- drug-induced insulin coma in nondiabetic
- hyperinsulinism with hypoglycemic coma
- hypoglycemic coma NOS
E15
)

The following code(s) above R40 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to R40:

R00-R99
2023 ICD-10-CM Range R00-R99
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Note
- This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- The conditions and signs or symptoms included in categories R00-R94 consist of:
- (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- (e) cases in which a more precise diagnosis was not available for any other reason;
- (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Type 2 Excludes
- 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)
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
R40-R46
2023 ICD-10-CM Range R40-R46
Symptoms and signs involving cognition, perception, emotional state and behavior
Type 2 Excludes
- symptoms and signs constituting part of a pattern of mental disorder (F01-F99)
Symptoms and signs involving cognition, perception, emotional state and behavior

Code History

2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
2017 (effective 10/1/2016): No change
2018 (effective 10/1/2017): No change
2019 (effective 10/1/2018): No change
2020 (effective 10/1/2019): No change
2021 (effective 10/1/2020): No change
2022 (effective 10/1/2021): No change
2023 (effective 10/1/2022): No change

Code annotations containing back-references to R40:

Type 1 Excludes: R41.82

ICD-10-CM Diagnosis Code R41.82
Altered mental status, unspecified
Applicable To
- Change in mental status NOS
Type 1 Excludes
- altered level of consciousness (R40.-)
- altered mental status due to known condition - code to condition
- delirium NOS (R41.0)
Use Additional: T67.0

ICD-10-CM Diagnosis Code T67.0
Heatstroke and sunstroke
Use Additional
- code(s) to identify any associated complications of heatstroke, such as:
- coma and stupor (R40.-)
- rhabdomyolysis (M62.82)
- systemic inflammatory response syndrome (R65.1-)

ICD-10-CM Codes Adjacent To R40

R39.192 Position dependent micturition

R39.198 Other difficulties with micturition

R39.2 Extrarenal uremia

R39.8 Other symptoms and signs involving the genitourinary system

R39.81 Functional urinary incontinence

R39.82 Chronic bladder pain

R39.83 Unilateral non-palpable testicle

R39.84 Bilateral non-palpable testicles

R39.89 Other symptoms and signs involving the genitourinary system

R39.9 Unspecified symptoms and signs involving the genitourinary system

R40 Somnolence, stupor and coma

R40.0 Somnolence

R40.1 Stupor

R40.2 Coma

R40.20 Unspecified coma

R40.21 Coma scale, eyes open

R40.211 Coma scale, eyes open, never

R40.2110 …… unspecified time

R40.2111 …… in the field [EMT or ambulance]

R40.2112 …… at arrival to emergency department

R40.2113 …… at hospital admission

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2023 ICD-10-CM Diagnosis Code R40

Somnolence, stupor and coma

Neonatal coma

Diabetes mellitus

Nondiabetic hypoglycemic coma

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

Symptoms and signs involving cognition, perception, emotional state and behavior

Altered mental status, unspecified

Heatstroke and sunstroke