2027 ICD-10-CM Diagnosis Code I80.3Phlebitis and thrombophlebitis of lower extremities, unspecified
ICD-10-CM Codes›I00–I99›I80-I89›I80
- Billable — Valid for Submission
- Not Chronic
I80.3 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of lower extremities, unspecified. 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, 791, 793. Coders also document this condition as bilateral lower limb vein thrombophlebitis. 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.
- Bilateral lower limb vein thrombophlebitis
- Left lower limb vein thrombophlebitis
- Phlebitis of lower limb vein
- Right lower limb vein thrombophlebitis
- Thrombophlebitis of lower extremities
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I80.3: 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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Deep Vein Thrombosis
Deep vein thrombosis, or DVT, is a blood clot that forms in a vein deep in the body. Most deep vein clots occur in the lower leg or thigh. If the vein swells, the condition is called thrombophlebitis. A deep vein thrombosis can break loose and cause a serious problem in the lung, called a pulmonary embolism.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I80.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I80.3Overview
What is the ICD-10 code for phlebitis and thrombophlebitis of lower extremities, unspecified?
The ICD-10-CM code for phlebitis and thrombophlebitis of lower extremities, unspecified is I80.3 (sometimes written as I803). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I80.3 (Phlebitis and thrombophlebitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis and thrombophlebitis of lower extremities, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I80.3 group to?
When phlebitis and thrombophlebitis of lower extremities, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 301, 300, 299, with relative weights from 0.7132 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Can I80.3 be reported with a code from I82.4?
Not as a rule. The Excludes1 note at I80, which applies to I80.3, 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 I80.3?
The Code First note at I80, which applies to I80.3, 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 I80.3.
