I88 Nonspecific lymphadenitis

Not billable (header)Chapter 9

Report one of the more specific codes below.

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Codes under this one

I88.0 Nonspecific mesenteric lymphadenitis
I88.1 Chronic lymphadenitis, except mesenteric
I88.8 Other nonspecific lymphadenitis
I88.9 Nonspecific lymphadenitis, unspecified

Instructional notes

Chapter 9

Excludes2Not included here: the patient may have both; report both when both are present.

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)
systemic connective tissue disorders (M30-M36)
transient cerebral ischemic attacks and related syndromes (G45.-)

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

acute lymphadenitis, except mesenteric (L04.-)
enlarged lymph nodes NOS (R59.-)
human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20)

Chapter 9: Diseases of the circulatory system · I80-I89 Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.