I80.9 is the authoritative medical code for Phlebitis and thrombophlebitis of unspecified site. This classification is used in medical billing and clinical recording to specify the clinical criteria for phlebitis and thrombophlebitis of unspecified site (ICD-10-CM I80.9), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Phlebitis and thrombophlebitis of unspecified site is a billable ICD-10-CM diagnosis code I80.9. Includes: endophlebitis; inflammation, vein; periphlebitis; suppurative phlebitis. Excludes1 (not coded here): venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-). Code first: , if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7); phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-).
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for I80.9 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- endophlebitis
- inflammation, vein
- periphlebitis
- suppurative phlebitis
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-)
Code First
Underlying conditions that must be sequenced before this code.
- , if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)
- phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-)
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with I80.9?
Per Excludes1 instructions, I80.9 must not be reported with: venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-).
Does I80.9 need to be sequenced after another code?
Yes. Code first: , if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7); phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as I80.9, with their registry titles.
- I80 — Phlebitis and thrombophlebitis
- I80.0 — Phlebitis and thrombophlebitis of superficial vessels of lower extremities
- I80.01 — Phlebitis and thrombophlebitis of superficial vessels of right lower extremity
- I80.02 — Phlebitis and thrombophlebitis of superficial vessels of left lower extremity
- I80.03 — Phlebitis and thrombophlebitis of superficial vessels of lower extremities, bilateral
- I80.1 — Phlebitis and thrombophlebitis of femoral vein
- I80.10 — Phlebitis and thrombophlebitis of unspecified femoral vein
- I80.11 — Phlebitis and thrombophlebitis of right femoral vein
- I80.12 — Phlebitis and thrombophlebitis of left femoral vein
- I80.13 — Phlebitis and thrombophlebitis of femoral vein, bilateral
- I80.2 — Phlebitis and thrombophlebitis of other and unspecified deep vessels of lower extremities
- I80.20 — Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremities
- I80.201 — Phlebitis and thrombophlebitis of unspecified deep vessels of right lower extremity
- I80.202 — Phlebitis and thrombophlebitis of unspecified deep vessels of left lower extremity
- I80.203 — Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremities, bilateral
- I80.209 — Phlebitis and thrombophlebitis of unspecified deep vessels of unspecified lower extremity
- I80.21 — Phlebitis and thrombophlebitis of iliac vein
- I80.211 — Phlebitis and thrombophlebitis of right iliac vein
- I80.212 — Phlebitis and thrombophlebitis of left iliac vein
- I80.213 — Phlebitis and thrombophlebitis of iliac vein, bilateral
- I80.219 — Phlebitis and thrombophlebitis of unspecified iliac vein
- I80.22 — Phlebitis and thrombophlebitis of popliteal vein
- I80.221 — Phlebitis and thrombophlebitis of right popliteal vein
- I80.222 — Phlebitis and thrombophlebitis of left popliteal vein
- I80.223 — Phlebitis and thrombophlebitis of popliteal vein, bilateral
- I80.229 — Phlebitis and thrombophlebitis of unspecified popliteal vein
- I80.23 — Phlebitis and thrombophlebitis of tibial vein
- I80.231 — Phlebitis and thrombophlebitis of right tibial vein
- I80.232 — Phlebitis and thrombophlebitis of left tibial vein
- I80.233 — Phlebitis and thrombophlebitis of tibial vein, bilateral
- I80.239 — Phlebitis and thrombophlebitis of unspecified tibial vein
- I80.24 — Phlebitis and thrombophlebitis of peroneal vein
- I80.241 — Phlebitis and thrombophlebitis of right peroneal vein
- I80.242 — Phlebitis and thrombophlebitis of left peroneal vein
- I80.243 — Phlebitis and thrombophlebitis of peroneal vein, bilateral
- I80.249 — Phlebitis and thrombophlebitis of unspecified peroneal vein
- I80.25 — Phlebitis and thrombophlebitis of calf muscular vein
- I80.251 — Phlebitis and thrombophlebitis of right calf muscular vein
- I80.252 — Phlebitis and thrombophlebitis of left calf muscular vein
- I80.253 — Phlebitis and thrombophlebitis of calf muscular vein, bilateral
Indexed Clinical Terms (4)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Inflammation, inflamed, inflammatory (with exudation), vein, thrombotic
- Phlebitis (infective) (pyemic) (septic) (suppurative)
- Phlebitis (infective) (pyemic) (septic) (suppurative), ulcerative
- Thrombophlebitis
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: