-
ICD-10-CM Codes
›
-
R00-R99
›
-
R99-R99
›
-
R99-
›
-
2024 ICD-10-CM Diagnosis Code R99
2024 ICD-10-CM Diagnosis Code R99
Ill-defined and unknown cause of mortality
2016 2017 2018 2019 2020 2021 2022 2023 2024 Billable/Specific Code
- R99 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2024 edition of ICD-10-CM R99 became effective on October 1, 2023.
- This is the American ICD-10-CM version of R99 - other international versions of ICD-10 R99 may differ.
Applicable To- Death (unexplained) NOS
- Unspecified cause of mortality
The following code(s) above
R99 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
R99:
Approximate Synonyms
- Death in less than 24 hours from onset of symptoms
- Death less than 24 hr from onset of symptoms
- Instantaneous death
- Sudden infant death syndrome
- Unattended death
ICD-10-CM R99 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):
- 951 Other factors influencing health status
Convert R99 to ICD-9-CM
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
- 2024 (effective 10/1/2023): No change
- Cot death R99
- Crib death R99
- Death (cause unknown) (of) (unexplained) (unspecified cause) R99
- Syndrome - see also Disease
ICD-10-CM Codes Adjacent To R99
R94.6 Abnormal results of thyroid function studies
R94.7 Abnormal results of other endocrine function studies
R94.8 Abnormal results of function studies of other organs and systems
R97 Abnormal tumor markers
R97.0 Elevated carcinoembryonic antigen [CEA]
R97.1 Elevated cancer antigen 125 [CA 125]
R97.2 Elevated prostate specific antigen [PSA]
R97.20 Elevated prostate specific antigen [PSA]
R97.21 Rising PSA following treatment for malignant neoplasm of prostate
R97.8 Other abnormal tumor markers
R99
Ill-defined and unknown cause of mortality
S00 Superficial injury of head
S00.0 Superficial injury of scalp
S00.00 Unspecified superficial injury of scalp
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.