799 Other ill-defined and unknown causes of morbidity and mortality (799.01-799.9) ICD-9-CM
The 799.01-799.9 block classified 799 other ill-defined and unknown causes of morbidity and mortality with 21 legacy diagnosis codes. None remain valid for claim submission; each code below links to its reference page with the official ICD-10-CM replacement under the CMS General Equivalence Mappings.
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.
Legacy Codes in the 799.01-799.9 Block 21 codes
None of these codes remain valid for claim submission. Each code page shows its ICD-10-CM replacement under the CMS General Equivalence Mappings.
- 799.01 Asphyxia
- 799.02 Hypoxemia
- 799.1 Respiratory arrest
- 799.21 Nervousness
- 799.22 Irritability
- 799.23 Impulsiveness
- 799.24 Emotional lability
- 799.25 Demoralization & apathy
- 799.29 Emotional state sym NEC
- 799.3 Debility NOS
- 799.4 Cachexia
- 799.51 Attn/concentrate deficit
- 799.52 Cog communicate deficit
- 799.53 Visuospatial deficit
- 799.54 Psychomotor deficit
- 799.55 Frontal lobe deficit
- 799.59 Cognition sign/sympt NEC
- 799.81 Decreased libido
- 799.82 Appar life threat-infant
- 799.89 Ill-define condition NEC
- 799.9 Unkn cause morb/mort NEC
Questions About This Page
Are the 799.01-799.9 codes still billable?
No. Every code in this block became invalid for U.S. claims after September 30, 2015. Each code page linked above shows the ICD-10-CM replacement CMS assigned in the General Equivalence Mappings, and the ICD-9 / ICD-10 converter translates any of them directly.
What did the 799.01-799.9 block classify?
The block classified 799 other ill-defined and unknown causes of morbidity and mortality with 21 codes in the final ICD-9-CM release. It sat under Symptoms, signs, and ill-defined conditions (780–799) in the legacy hierarchy.
Related References
Source: final CMS ICD-9-CM release (version date October 1, 2014). Retired from U.S. claims after September 30, 2015.
