Is R99 a billable ICD-10-CM code?

Yes. R99 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does R99 sit in the tabular list?

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block Ill-defined and unknown cause of mortality (R99).

R99

R99 — Ill-defined and unknown cause of mortality

Billable / specific codeICD-10-CM

R99 is a billable, specific ICD-10-CM code for ill-defined and unknown cause of mortality. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Death (unexplained) NOS
Unspecified cause of mortality

Risk adjustment

R99 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How R99 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to R99.

Cot death
Crib death
Death(cause unknown) (of) (unexplained) (unspecified cause)
Sudden infant death syndrome(SIDS)
Syndrome›crib death

Questions about R99

Is R99 a billable ICD-10-CM code?: Yes. R99 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does R99 sit in the tabular list?: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block Ill-defined and unknown cause of mortality (R99).