2027 ICD-10-CM Diagnosis Code I80.02Phlebitis and thrombophlebitis of superficial vessels of left lower extremity

ICD-10-CM Codes›I00–I99›I80-I89›I80

ICD-10-CM I80.02
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I80.02 is a billable ICD-10-CM diagnosis code for phlebitis and thrombophlebitis of superficial vessels of left 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. Coders also document this condition as saphenous vein thrombophlebitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute phlebitis; thrombophlebitis and thromboembolism.

Code Identity

ICD-10-CM Code
I80.02
Billable Status
Yes — Valid for Submission
Code Describes
Phlebitis and thrombophlebitis of superficial vessels of left lower extremity
Short Description
Phlebitis and thombophlb of superfic vessels of l low extrem
Parent Code
I80.0
Phlebitis and thrombophlebitis of superficial vessels of lower extremities

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI80-I89Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified
CategoryI80Phlebitis and thrombophlebitis
This CodeI80.02Phlebitis and thrombophlebitis of superficial vessels of left lower extremity

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Saphenous vein thrombophlebitis
  • Thrombophlebitis of left saphenous vein
  • Thrombophlebitis of superficial vein of left lower limb

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I80.02: 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.

From I80 Phlebitis and thrombophlebitis applies to 39 codes
  • 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.

From I80 Phlebitis and thrombophlebitis applies to 39 codes

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.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • 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.

From I80 Phlebitis and thrombophlebitis applies to 39 codes
  • 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.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I80.02, its category, or a range that includes it.

Use Additional Code 2

These codes say to use an additional code from the note, and I80.02 is one of the codes named.

  • O22.2 Superficial thrombophlebitis in pregnancy
    code to identify the superficial thrombophlebitis (I80.0-) names I80.0-, which includes this code
  • O87.0 Superficial thrombophlebitis in the puerperium
    code, 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.

CCSR CIR033
Acute phlebitis; thrombophlebitis and thromboembolism
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert I80.02 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
451.0 Superfic phlebitis-leg
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I80.02Overview

Is I80.02 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report phlebitis and thrombophlebitis of superficial vessels of left lower extremity on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I80.02 group to?

When phlebitis and thrombophlebitis of superficial vessels of left 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 I80.02 be reported with a code from I82.4?

Not as a rule. The Excludes1 note at I80, which applies to I80.02, 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 I80.02?

The Code First note at I80, which applies to I80.02, 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 I80.02.

What is the ICD-9 equivalent of I80.02?

Under the General Equivalence Mappings, phlebitis and thrombophlebitis of superficial vessels of left lower extremity converts to ICD-9-CM 451.0 (superfic phlebitis-leg). The mapping is approximate, so confirm the match fits the documentation.