Is R50 a billable ICD-10-CM code?

No. R50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does R50 sit in the tabular list?

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block General symptoms and signs (R50-R69).

What cannot be coded together with R50?

R50 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

R50

R50 — Fever of other and unknown origin

Non-billable headerICD-10-CM

R50 is a non-billable header ICD-10-CM code for fever of other and unknown origin. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

chills without fever (R68.83)
febrile convulsions (R56.0-)
fever of unknown origin during labor (O75.2)
fever of unknown origin in newborn (P81.9)
hypothermia due to illness (R68.0)
malignant hyperthermia due to anesthesia (T88.3)
puerperal pyrexia NOS (O86.4)

Other codes that can never be billed with R50

These codes carry an Excludes1 note pointing at R50. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading R50 alone.

O86.0Infection of obstetric surgical wound
R50.2Drug induced fever
R50.82Postprocedural fever
R68.83Chills (without fever)

Risk adjustment

R50 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.

Code to one of these instead R50

3 child codes. Green means billable.

Questions about R50

Is R50 a billable ICD-10-CM code?: No. R50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does R50 sit in the tabular list?: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block General symptoms and signs (R50-R69).
What cannot be coded together with R50?: R50 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.