2027 ICD-10-CM Diagnosis Code I80.00Phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity
ICD-10-CM Codes›I00–I99›I80-I89›I80
- Billable — Valid for Submission
- Not Chronic
I80.00 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 299 through 301. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute phlebitis; thrombophlebitis and thromboembolism.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Deep venous thrombosis of femoropopliteal vein
- Phlebitis of dorsal venous arch of foot
- Phlebitis of femoropopliteal vein
- Phlebitis of popliteal vein
- Phlebitis of superficial veins of lower extremity
- Phlebitis of the femoral vein
- Saphenous vein phlebitis
- Saphenous vein thrombophlebitis
- Superficial thrombophlebitis of long saphenous vein
- Superficial thrombophlebitis of short saphenous vein
- Thrombophlebitis of dorsal venous arch of foot
- Thrombophlebitis of femoropopliteal vein
- Thrombophlebitis of superficial veins of lower leg
- Thrombophlebitis of the femoral vein
- Thrombophlebitis of the popliteal vein
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I80.00: its own notes plus those printed at I80 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- endophlebitis
- inflammation, vein
- periphlebitis
- suppurative phlebitis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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.-)
Code First
The underlying condition named in the note is sequenced before this code.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I80.00, its category, or a range that includes it.
Use Additional Code 2
These codes say to use an additional code from the note, and I80.00 is one of the codes named.
- O22.2 Superficial thrombophlebitis in pregnancycode to identify the superficial thrombophlebitis (I80.0-) names I80.0-, which includes this code
- O87.0 Superficial thrombophlebitis in the puerperiumcode, if applicable, to identify the superficial vein thrombosis, such as thrombosis of superficial vessels of lower extremities (I80.0-) names I80.0-, which includes this code
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert I80.00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I80.00Overview
Is I80.00 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I80.00 group to?
When phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity is the principal diagnosis on an inpatient stay, it groups to MS-DRG 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.
Can I80.00 be reported with a code from I82.4?
Not as a rule. The Excludes1 note at I80, which applies to I80.00, lists "venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is coded first with I80.00?
The Code First note at I80, which applies to I80.00, reads: 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.-). When one of these applies, it is sequenced before I80.00.
What is the ICD-9 equivalent of I80.00?
Under the General Equivalence Mappings, phlebitis and thrombophlebitis of superficial vessels of unspecified lower extremity converts to ICD-9-CM 451.0 (superfic phlebitis-leg). The mapping is approximate, so confirm the match fits the documentation.
