Phlebitis and thrombophlebitis (I80) ICD-10-CM
The I80 code range covers phlebitis and thrombophlebitis with 50 ICD-10-CM diagnosis codes. 39 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- endophlebitis
- inflammation, vein
- periphlebitis
- suppurative phlebitis
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- , 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
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the I80 Range 50 codes · 39 billable
- I80 Phlebitis and thrombophlebitisNon-billable
- I80.0 Phlebitis and thrombophlebitis of superficial vessels of lower extremitiesNon-billable
- I80.00 Phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity
- 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 veinNon-billable
- 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 extremitiesNon-billable
- I80.20 Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremitiesNon-billable
- 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 veinNon-billable
- 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 veinNon-billable
- 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 veinNon-billable
- 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 veinNon-billable
- 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 veinNon-billable
- 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
- I80.259 Phlebitis and thrombophlebitis of unspecified calf muscular vein
- I80.29 Phlebitis and thrombophlebitis of other deep vessels of lower extremitiesNon-billable
- I80.291 Phlebitis and thrombophlebitis of other deep vessels of right lower extremity
- I80.292 Phlebitis and thrombophlebitis of other deep vessels of left lower extremity
- I80.293 Phlebitis and thrombophlebitis of other deep vessels of lower extremity, bilateral
- I80.299 Phlebitis and thrombophlebitis of other deep vessels of unspecified lower extremity
- I80.3 Phlebitis and thrombophlebitis of lower extremities, unspecified
- I80.8 Phlebitis and thrombophlebitis of other sites
- I80.9 Phlebitis and thrombophlebitis of unspecified site
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I80 range.
Cavernous Sinus Thrombosis
Formation or presence of a blood clot (THROMBUS) in the CAVERNOUS SINUS of the brain. Infections of the paranasal sinuses and adjacent structures, CRANIOCEREBRAL TRAUMA, and THROMBOPHILIA are associated conditions. Clinical manifestations include dysfunction of cranial nerves III, IV, V, and VI, marked periorbital swelling, chemosis, fever, and visual loss. (From Adams et al., Principles of Neurology, 6th ed, p711)
Lateral Sinus Thrombosis
Formation or presence of a blood clot (THROMBUS) in the LATERAL SINUSES. This condition is often associated with ear infections (OTITIS MEDIA or MASTOIDITIS) without antibiotic treatment. In developed nations, lateral sinus thrombosis can result from CRANIOCEREBRAL TRAUMA; BRAIN NEOPLASMS; NEUROSURGICAL PROCEDURES; THROMBOPHILIA; and other conditions. Clinical features include HEADACHE; VERTIGO; and increased intracranial pressure.
Lemierre Syndrome
A superinfection of the damaged oropharyngeal mucosa by FUSOBACTERIUM NECROPHORUM leading to the secondary septic THROMBOPHLEBITIS of the internal jugular vein.
Phlebitis
Inflammation of a vein, often a vein in the leg. Phlebitis associated with a blood clot is called (THROMBOPHLEBITIS).
Sagittal Sinus Thrombosis
Formation or presence of a blood clot (THROMBUS) in the SUPERIOR SAGITTAL SINUS or the inferior sagittal sinus. Sagittal sinus thrombosis can result from infections, hematological disorders, CRANIOCEREBRAL TRAUMA; and NEUROSURGICAL PROCEDURES. Clinical features are primarily related to the increased intracranial pressure causing HEADACHE; NAUSEA; and VOMITING. Severe cases can evolve to SEIZURES or COMA.
Sinus Thrombosis, Intracranial
Formation or presence of a blood clot (THROMBUS) in the CRANIAL SINUSES, large endothelium-lined venous channels situated within the SKULL. Intracranial sinuses, also called cranial venous sinuses, include the superior sagittal, cavernous, lateral, petrous sinuses, and many others. Cranial sinus thrombosis can lead to severe HEADACHE; SEIZURE; and other neurological defects.
Thrombophlebitis
Inflammation of a vein associated with a blood clot (THROMBUS).
About the I80 Code Range
ICD-10 codes in the I80 category identify phlebitis and thrombophlebitis, which are inflammations and clots in veins, primarily in the lower extremities.
This section describes conditions like superficial thrombophlebitis and deep vein thrombosis affecting veins such as the saphenous, femoral, popliteal, tibial, peroneal, and iliac veins. For example, codes like I80.01 specify thrombophlebitis of the right lower extremity's superficial veins, while codes from I80.10 to I80.13 cover femoral vein involvement. Recognizing synonyms such as “saphenous vein thrombophlebitis” or “deep venous thrombosis of femoropopliteal vein” helps medical coders connect clinical terms to the correct ICD-10 code for accurate documentation. This section also includes less common sites like upper extremity veins and unspecified sites, captured in codes I80.8 and I80.9. Using these codes ensures precise coding for varied presentations of vein inflammation and clotting, facilitating targeted care and proper health record classification.
Questions About This Page
How many billable codes are in the I80 range?
Of the 50 codes in this range, 39 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I80 range classify?
The range classifies phlebitis and thrombophlebitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
