ICD-10-CM 2027
ICD-10 code for lymphadenitis
From the official ICD-10-CM alphabetic index entry “Lymphadenitis”. Page updated September 29, 2026.
About coding lymphadenitis
The ICD-10-CM code for lymphadenitis is I88.9 (Nonspecific lymphadenitis, unspecified). The official index lists 37 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I88.9.
Within I88, choose I88.9 (unspecified) only when documentation doesn't support a more specific option: nonspecific mesenteric lymphadenitis (I88.0), chronic lymphadenitis, except mesenteric (I88.1) and other nonspecific lymphadenitis (I88.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific lymphadenitis codes (official index)
- with ectopic or molar pregnancy O08.0 — Genital tract and pelvic infection following ectopic and molar pregnancy
- acute L04.9 — Acute lymphadenitis, unspecified
- axilla L04.2 — Acute lymphadenitis of upper limb
- face L04.0 — Acute lymphadenitis of face, head and neck
- head L04.0 — Acute lymphadenitis of face, head and neck
- hip L04.3 — Acute lymphadenitis of lower limb
- limb
- lower L04.3 — Acute lymphadenitis of lower limb
- upper L04.2 — Acute lymphadenitis of upper limb
- neck L04.0 — Acute lymphadenitis of face, head and neck
- shoulder L04.2 — Acute lymphadenitis of upper limb
- specified site NEC L04.8 — Acute lymphadenitis of other sites
- trunk L04.1 — Acute lymphadenitis of trunk
- anthracosis (occupational) J60 — Coalworker's pneumoconiosis
- any site, except mesenteric I88.9 — Nonspecific lymphadenitis, unspecified
- chronic I88.1 — Chronic lymphadenitis, except mesenteric
- subacute I88.1 — Chronic lymphadenitis, except mesenteric
- breast
- gestational
- puerperal, postpartum (nonpurulent) O91.22 — Nonpurulent mastitis associated with the puerperium
- chancroidal (congenital) A57 — Chancroid
- chronic I88.1 — Chronic lymphadenitis, except mesenteric
- mesenteric I88.0 — Nonspecific mesenteric lymphadenitis
- due to
- Brugia (malayi) B74.1 — Filariasis due to Brugia malayi
- timori B74.2 — Filariasis due to Brugia timori
- chlamydial lymphogranuloma A55 — Chlamydial lymphogranuloma (venereum)
- diphtheria (toxin) A36.89 — Other diphtheritic complications
- lymphogranuloma venereum A55 — Chlamydial lymphogranuloma (venereum)
- Wuchereria bancrofti B74.0 — Filariasis due to Wuchereria bancrofti
- following ectopic or molar pregnancy O08.0 — Genital tract and pelvic infection following ectopic and molar pregnancy
- gonorrheal A54.89 — Other gonococcal infections
- infective
- mesenteric (acute) (chronic) (nonspecific) (subacute) I88.0 — Nonspecific mesenteric lymphadenitis
- due to Salmonella typhi A01.09 — Typhoid fever with other complications
- tuberculous A18.39 — Retroperitoneal tuberculosis
- mycobacterial A31.8 — Other mycobacterial infections
- purulent
- pyogenic
- regional, nonbacterial I88.8 — Other nonspecific lymphadenitis
- septic
- subacute, unspecified site I88.1 — Chronic lymphadenitis, except mesenteric
- suppurative
- syphilitic (early) (secondary) A51.49 — Other secondary syphilitic conditions
- late A52.79 — Other symptomatic late syphilis
- tuberculous
- venereal (chlamydial) A55 — Chlamydial lymphogranuloma (venereum)
Common questions about lymphadenitis ICD-10 codes
What is the ICD-10 code for lymphadenitis?
- I88.9 — Nonspecific lymphadenitis, unspecified. More specific codes apply when the documentation supports them: O08.0, L04.9, L04.2, L04.0 and others below.
What is the ICD-10 code for acute lymphadenitis?
- L04.9 — Acute lymphadenitis, unspecified.
What is the ICD-10 code for anthracosis lymphadenitis?
- J60 — Coalworker's pneumoconiosis.
What is the ICD-10 code for chancroidal lymphadenitis?
- A57 — Chancroid.
What is the ICD-10 code for chronic lymphadenitis?
- I88.1 — Chronic lymphadenitis, except mesenteric.
What is the ICD-10 code for gonorrheal lymphadenitis?
- A54.89 — Other gonococcal infections.
What is the ICD-10 code for mesenteric lymphadenitis?
- I88.0 — Nonspecific mesenteric lymphadenitis.
Is I88.9 billable?
- Yes. I88.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I88.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I88.9 as a principal diagnosis.
Is I88.9 a CC or MCC?
- No. I88.9 is neither a CC nor an MCC under MS-DRG v44.0.