I80.21 is the authoritative medical code for Phlebitis and thrombophlebitis of iliac vein. This classification is used in medical billing and clinical recording to specify the clinical criteria for phlebitis and thrombophlebitis of iliac vein (ICD-10-CM I80.21), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Phlebitis and thrombophlebitis of iliac vein is a non-billable ICD-10-CM category code I80.21. A more specific billable subcode must be selected for claims submission. Includes: endophlebitis; inflammation, vein; periphlebitis; suppurative phlebitis. Inclusion terms: Phlebitis and thrombophlebitis of common iliac vein; Phlebitis and thrombophlebitis of external iliac vein; Phlebitis and thrombophlebitis of internal iliac vein. Excludes1 (not coded here): venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-). Code first: , 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.-).
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for I80.21 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- endophlebitis
- inflammation, vein
- periphlebitis
- suppurative phlebitis
Inclusion Terms
Alternative terms the tabular list files under this code.
- Phlebitis and thrombophlebitis of common iliac vein
- Phlebitis and thrombophlebitis of external iliac vein
- Phlebitis and thrombophlebitis of internal iliac vein
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-)
Code First
Underlying conditions that must be sequenced before this code.
- , 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.-)
Frequently Asked Questions (FAQ) & Clinical Guidance
Can I80.21 be billed directly?
No. I80.21 (Phlebitis and thrombophlebitis of iliac vein) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
What can't be coded together with I80.21?
Per Excludes1 instructions, I80.21 must not be reported with: venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-).
Does I80.21 need to be sequenced after another code?
Yes. Code first: , 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.-).
What conditions are included under I80.21?
Phlebitis and thrombophlebitis of iliac vein includes: Phlebitis and thrombophlebitis of common iliac vein; Phlebitis and thrombophlebitis of external iliac vein; Phlebitis and thrombophlebitis of internal iliac vein.
Codes in This Family (4)
Official ICD-10-CM classifications in the same code family as I80.21, with their registry titles.
- I80.211 — Phlebitis and thrombophlebitis of right iliac vein
- I80.212 — Phlebitis and thrombophlebitis of left iliac vein
- I80.213 — Phlebitis and thrombophlebitis of iliac vein, bilateral
- I80.219 — Phlebitis and thrombophlebitis of unspecified iliac vein
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code I83.21
Varicose veins of right lower extremity with both ulcer and inflammation