Billable / Specific Code
ICD-10-CM I80.209 is the diagnosis code for Phlebitis and thrombophlebitis of unspecified deep vessels of unspecified lower extremity. This code falls under the section "Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified" within Chapter 9 — Diseases of the circulatory system (I00-I99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where I80.209 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, I80.209 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
I80.209 is the ICD-10-CM diagnosis code for "Phlebitis and thrombophlebitis of unspecified deep vessels of unspecified lower extremity". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of I80.209 is I80.20 ("Phlebitis and thrombophlebitis of unspecified deep vessels of lower extremities"). I80.209 provides a more specific classification within this category.
I80.209 is located in Section I80-I89 — "Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified" within Chapter 9 of the ICD-10-CM Tabular List.
Use I80.209 when the patients documented diagnosis matches "Phlebitis and thrombophlebitis of unspecified deep vessels of unspecified lower extremity" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Phlebitis and thrombophlebitis of unspecified deep vessels of unspecified lower extremity is I80.209.
Yes, I80.209 can be used as a primary diagnosis code since it is billable and specific.
I80.209 is in Chapter 9 of the ICD-10-CM Tabular List.
Yes, I80.209 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.