ICD-10-CM · Chapter 12 · L00-L99
L04 Acute lymphadenitis
Includes
- abscess (acute) of lymph nodes, except mesenteric
- acute lymphadenitis, except mesenteric
Excludes 1 (cannot be coded together)
- chronic or subacute lymphadenitis, except mesenteric (I88.1)
- enlarged lymph nodes (R59.-)
- human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20)
- lymphadenitis NOS (I88.9)
- nonspecific mesenteric lymphadenitis (I88.0)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| L04..0 | Acute lymphadenitis of face, head and neck | Yes |
| L04..1 | Acute lymphadenitis of trunk | Yes |
| L04..2 | Acute lymphadenitis of upper limb | Yes |
| L04..3 | Acute lymphadenitis of lower limb | Yes |
| L04..8 | Acute lymphadenitis of other sites | Yes |
| L04..9 | Acute lymphadenitis, unspecified | Yes |
Last reviewed: September 2026