Specific code 2015 ICD-9-CM Diagnosis Code 799.9
Other unknown and unspecified cause of morbidity and mortality
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 799.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 799.9 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 799.9 converts approximately to:
  • 2015/16 ICD-10-CM R69 Illness, unspecified
  • 2015/16 ICD-10-CM R99 Ill-defined and unknown cause of mortality
Approximate Synonyms
  • Accidental death in home
  • Accidental death in public place
  • Chronic sick
  • Death by cremation
  • Death by electrocution
  • Death by fire
  • Death by immolation
  • Death from any obstetric cause occurring more than 42 days but less than one year after delivery
  • Death from overwork
  • Death of unknown cause
  • Deferred diagnosis on Axis II
  • Determination of outcome, death avoidable, chart audit required
  • Determination of outcome, death avoidable, error in judgement
  • Diagnosis deferred
  • Died without sign of disease
  • Disease
  • Disinterment for establishment of cause of death
  • Effect of drug maladministration
  • Functional disorder present, condition terminal
  • Iatrogenic death
  • Iatrogenic disorder
  • Ill defined condition
  • Ill-defined disease
  • Multiple organ failure
  • Natural death
  • Natural death with probable cause suspected
  • Natural death with proved cause
  • Natural death with proved cause by autopsy
  • Natural death with proved cause without autopsy
  • Natural death with unknown cause
  • On examination - dead
  • On examination - dead - expected
  • On examination - dead - suspicious death
  • On examination - dead - unexpected
  • Patient died in general practice premises
  • Sequelae of disorders
  • Single organ dysfunction
  • Traffic vehicular accidental death
  • Undetermined manner of death, accidental cause suspected
  • Undetermined manner of death, accidental means suspected
  • Undetermined manner of death, homicide suspected
  • Undetermined manner of death, natural causes suspected
  • Undetermined manner of death, suicide suspected
Applies To
  • Undiagnosed disease, not specified as to site or system involved
  • Unknown cause of morbidity or mortality
ICD-9-CM Volume 2 Index entries containing back-references to 799.9:
  • Cause
    • not stated 799.9
    • unknown 799.9
  • Diagnosis deferred 799.9
  • Disease, diseased - see also Syndrome
    • undiagnosed 799.9
  • No
    • diagnosis 799.9
  • Sick 799.9
    • or handicapped person in family V61.49
  • Surgical
    • operation NEC 799.9
  • Undetermined diagnosis or cause 799.9
  • Undiagnosed (disease) 799.9
  • Unknown
    • cause of death 799.9
    • diagnosis 799.9
  • Unspecified cause of death 799.9
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 799.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.