Is Q66.5 a billable ICD-10-CM code?

No. Q66.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Q66.5 sit in the tabular list?

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations and deformations of the musculoskeletal system (Q65-Q79).

What cannot be coded together with Q66.5?

Q66.5 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

Q66.5

Q66.5 — Congenital pes planus

Non-billable headerICD-10-CM

Q66.5 is a non-billable header ICD-10-CM code for congenital pes planus. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

pes planus, acquired (M21.4)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Congenital flat foot
Congenital rigid flat foot
Congenital spastic (everted) flat foot

Other codes that can never be billed with Q66.5

These codes carry an Excludes1 note pointing at Q66.5. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q66.5 alone.

M21.4Flat foot [pes planus] (acquired)

Risk adjustment

Q66.5 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.

Code to one of these instead Q66.5

3 child codes. Green means billable.

Related codes at this level

Codes that share Q66. If Q66.5 is not quite right, the correct code is usually one of these.

Questions about Q66.5

Is Q66.5 a billable ICD-10-CM code?: No. Q66.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Q66.5 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations and deformations of the musculoskeletal system (Q65-Q79).
What cannot be coded together with Q66.5?: Q66.5 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.