FY2027 ICD-10-CM reference
I80.299: Phlebitis and thrombophlebitis of other deep vessels of unspecified lower extremity
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Phlebitis and thrombophlebitis of other deep vessels of unspecified lower extremity. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: I00-I99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: I00-I99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: I00-I99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: I00-I99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: I00-I99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: I00-I99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: I00-I99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: I00-I99 (chapter, inherited).
Excludes2
systemic connective tissue disorders (M30-M36)
Source: I00-I99 (chapter, inherited).
Excludes2
transient cerebral ischemic attacks and related syndromes (G45.-)
Source: I00-I99 (chapter, inherited).
Includes
endophlebitis
Source: I80 (category, inherited).
Includes
inflammation, vein
Source: I80 (category, inherited).
Includes
periphlebitis
Source: I80 (category, inherited).
Includes
suppurative phlebitis
Source: I80 (category, inherited).
Code first
, if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)
Source: I80 (category, inherited).
Code first
phlebitis and thrombophlebitis complicating pregnancy, childbirth and the puerperium (O22.-, O87.-)
Source: I80 (category, inherited).
Excludes1
venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-)
Source: I80 (category, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does I80.299 mean in FY2027?
The official ICD-10-CM descriptor is Phlebitis and thrombophlebitis of other deep vessels of unspecified lower extremity. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is I80.299 billable in FY2027?
The FY2027 order file marks I80.299 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does I80.299 map to an HCC?
In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), I80.299 maps to CMS-HCC V28 HCC 267 (Deep Vein Thrombosis and Pulmonary Embolism). For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition