Ill-defined and unknown causes of morbidity and mortality (797-799) ICD-9-CM
The 797-799 section covered ill-defined and unknown causes of morbidity and mortality with 26 legacy diagnosis codes across 3 code blocks. The info icons preview the first codes of each block, and every code page carries its ICD-10-CM crosswalk.
Retired Code Set
ICD-9-CM stopped being valid for U.S. claims with dates of service on or after October 1, 2015, when ICD-10-CM replaced it. Use this index for historical lookups and crosswalking; for current coding, start from the ICD-10-CM codes list or the ICD-9 / ICD-10 converter.
Code Blocks in This Section 3 blocks · 26 codes
| Range | Block | Codes |
|---|---|---|
| 797 | 797 Senility without mention of psychosis | 1 |
| 798.0-798.9 | 798 Sudden death, cause unknown | 4 |
| 799.01-799.9 | 799 Other ill-defined and unknown causes of morbidity and mortality | 21 |
The info icon previews what each row contains.
Questions About This Page
How many codes are in the 797-799 section?
The 797-799 section contains 26 legacy diagnosis codes across 3 code blocks in the final ICD-9-CM release.
Can I still use these codes on claims?
No. ICD-9-CM was retired on October 1, 2015. To code ill-defined and unknown causes of morbidity and mortality today, use the current ICD-10-CM codes: every legacy code page in this range links its official replacement, and the ICD-9 / ICD-10 converter translates codes in both directions.
Related References
Source: final CMS ICD-9-CM release (version date October 1, 2014). Retired from U.S. claims after September 30, 2015.
