I80.9
Phlebitis and thrombophlebitis of unspecified site
I80.9 (also written I809) is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of unspecified site. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 39 codes in category I80 (Phlebitis and thrombophlebitis). The Alphabetic Index lists it under 4 entries. Its coding notes include a Code first instruction, 1 Excludes1 entry and 10 Excludes2 entries.
Code first
If the underlying condition listed here is present and known, sequence it first.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- 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.-)
Includes
Further defines or gives examples of the content of the category.
- endophlebitis
- inflammation, vein
- periphlebitis
- suppurative phlebitis
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 4 entries