2027 ICD-10-CM Diagnosis Code I80.9Phlebitis and thrombophlebitis of unspecified site
ICD-10-CM Codes›I00–I99›I80-I89›I80
- Billable — Valid for Submission
- Not Chronic
I80.9 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of unspecified site. 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 thrombophlebitis
- Endophlebitis
- Neonatal thrombophlebitis
- Periphlebitis
- Phlebitis
- Phlebitis after infusion
- Phlebitis due to procedure
- Phlebitis during procedure
- Phlebitis following perfusion
- Phlebitis following transfusion
- Septic thrombophlebitis
- Sequela of phlebitis
- Superficial thrombophlebitis
- Superficial thrombophlebitis following administration of drug via intravenous route
- Suppurative phlebitis
- Thrombophlebitis
- Thrombophlebitis after infusion
- Thrombophlebitis caused by ionizing radiation
- Thrombophlebitis due to procedure
- Thrombophlebitis during procedure
- Thrombophlebitis following perfusion
- Thrombophlebitis following transfusion
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I80.9: 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.
Inflammation, inflamed, inflammatory (with exudation)
vein See Also: Phlebitis;
thrombotic I80.9
Thrombophlebitis I80.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Phlebitis
inflammation of a vein, often a vein in the leg. phlebitis associated with a blood clot is called (thrombophlebitis).Thrombophlebitis
inflammation of a vein associated with a blood clot (thrombus).
Convert I80.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I80.9Overview
What is the ICD-10 code for phlebitis and thrombophlebitis of unspecified site?
The ICD-10-CM code for phlebitis and thrombophlebitis of unspecified site is I80.9 (sometimes written as I809). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I80.9 (Phlebitis and thrombophlebitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis and thrombophlebitis of unspecified site on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I80.9 group to?
When phlebitis and thrombophlebitis of unspecified site 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 I80.9 be reported with a code from I82.4?
Not as a rule. The Excludes1 note at I80, which applies to I80.9, 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 I80.9?
The Code First note at I80, which applies to I80.9, 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 I80.9.
