Is O22.21 a billable ICD-10-CM code?

Yes. O22.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does O22.21 sit in the tabular list?

Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other maternal disorders predominantly related to pregnancy (O20-O29).

What cannot be coded together with O22.21?

O22.21 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 O22.21 (O22) and apply to it just the same.

O22.21

O22.21 — Superficial thrombophlebitis in pregnancy, first trimester

Billable / specific codeICD-10-CM

O22.21 is a billable, specific ICD-10-CM code for superficial thrombophlebitis in pregnancy, first trimester. It is valid for submission on a claim.

Excludes1 inherited from the categories above O22.21

These are not written on O22.21, but they bind it: a note on a category applies to every code beneath it. Billing O22.21 with anything listed here is a denial.

Written on O22 — Venous complications and hemorrhoids in pregnancy

venous complications of:
abortion NOS (O03.9)
ectopic or molar pregnancy (O08.7)
failed attempted abortion (O07.35)
induced abortion (O04.85)
spontaneous abortion (O03.89)

Excludes2 inherited from the categories above O22.21

Also inherited, and the opposite of Excludes1: these conditions are not part of O22.21, but a patient can have both, so you may code both.

Written on O22 — Venous complications and hemorrhoids in pregnancy

obstetric pulmonary embolism (O88.-)
venous complications and hemorrhoids of childbirth and the puerperium (O87.-)

Risk adjustment

O22.21 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.

Medicare coverage

O22.21 is named in 3 Medicare coverage policies — 3 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56697Billing and Coding: Non-Invasive Vascular Studies
A56758Billing and Coding: Non-Invasive Vascular Studies
A57594Billing and Coding: Non-Invasive Peripheral Venous Vascular and Hemodialysis Access Studies

Code history

O22.21 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 O22.2. If O22.21 is not quite right, the correct code is usually one of these.

Questions about O22.21

Is O22.21 a billable ICD-10-CM code?: Yes. O22.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does O22.21 sit in the tabular list?: Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other maternal disorders predominantly related to pregnancy (O20-O29).
What cannot be coded together with O22.21?: O22.21 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 O22.21 (O22) and apply to it just the same.