Alphabetic Index FY2027

G51.0

Bell's palsy

FY2027Chapter 6: Diseases of the nervous system/G50–G59 Nerve, nerve root and plexus disorders

BillableComplete code, valid to report
Care settingsHome Health Primary · Neuro Rehabilitation

G51.0 (also written G510) is a billable ICD-10-CM diagnosis code for bell's palsy. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 10 codes in category G51 (Facial nerve disorders). The Alphabetic Index lists it under 7 entries. Its coding notes include 5 Excludes1 entries and 8 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Also from chapter/block level (5 notes)
Inherited from G50–G59 Nerve, nerve root and plexus disorders
  • current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
  • neuralgia NOS (M79.2)
  • neuritis NOS (M79.2)
  • peripheral neuritis in pregnancy (O26.82-)
  • radiculitis NOS (M54.1-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (8 notes)
Inherited from Chapter 6 Diseases of the nervous system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Neuro Rehabilitation clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Includes

Further defines or gives examples of the content of the category.

Inherited from G51 Facial nerve disorders
  • disorders of 7th cranial nerve

Inclusion terms

Conditions classified to this code.

This code
  • Facial palsy

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 7 entries