I88.9 Nonspecific lymphadenitis, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Lymphadenitis NOS

Applies from I88 Nonspecific lymphadenitis

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 814-816 in MDC 16.

Approximate ICD-9-CM (GEMs)

• 289.3 Lymphadenitis, unspecified, except mesenteric (approximate)

Code annotations containing back-references to I88.9

Back-references to I88.9

• Type 2 Excludes: D75 Other and unspecified diseases of blood and blood-forming organs ("lymphadenitis NOS (I88.9)")
• Type 1 Excludes: L04 Acute lymphadenitis ("lymphadenitis NOS (I88.9)")
• Type 1 Excludes: R59 Enlarged lymph nodes ("lymphadenitis NOS (I88.9)")

Diagnosis Index entries for I88.9

• Adenitis › axillary
• Adenitis › cervical
• Adenitis › groin
• Adenitis › inguinal
• Adenitis › lymph gland or node, except mesenteric
• Infiltrate, infiltration › lymphatic › gland
• Lymphadenitis
• Lymphadenitis › any site, except mesenteric

Nearby codes

• I88 Nonspecific lymphadenitis
• I88.0 Nonspecific mesenteric lymphadenitis
• I88.1 Chronic lymphadenitis, except mesenteric
• I88.8 Other nonspecific lymphadenitis
• I88.9 Nonspecific lymphadenitis, unspecified (this code)