Is I80.9 a billable ICD-10-CM code?

Yes. I80.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I80.9 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89).

What cannot be coded together with I80.9?

I80.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above I80.9 (I80) and apply to it just the same.

I80.9

I80.9 — Phlebitis and thrombophlebitis of unspecified site

Billable / specific codeICD-10-CM

I80.9 is a billable, specific ICD-10-CM code for phlebitis and thrombophlebitis of unspecified site. It is valid for submission on a claim.

Excludes1 inherited from the categories above I80.9

These are not written on I80.9, but they bind it: a note on a category applies to every code beneath it. Billing I80.9 with anything listed here is a denial.

Written on I80 — Phlebitis and thrombophlebitis

venous embolism and thrombosis of lower extremities (I82.4-, I82.5-, I82.81-)

Risk adjustment

I80.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How I80.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I80.9.

Phlebitis(infective) (pyemic) (septic) (suppurative)
Thrombophlebitis
Phlebitis›ulcerative
Inflammation, inflamed, inflammatory›vein›thrombotic

Code history

I80.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share I80. If I80.9 is not quite right, the correct code is usually one of these.

Questions about I80.9

Is I80.9 a billable ICD-10-CM code?: Yes. I80.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I80.9 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89).
What cannot be coded together with I80.9?: I80.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above I80.9 (I80) and apply to it just the same.