What is the ICD-10 code for acquired flat foot?

The ICD-10 code for acquired flat foot is M21.41 for the right foot and M21.42 for the left foot. These codes require documentation of acquired status and laterality.

How do you differentiate between acquired and congenital flat foot?

Acquired flat foot develops after birth, often due to external factors, while congenital flat foot is present from birth and often involves a rigid deformity.

ICD-10 Coding for Flat Foot(M21.41, E11.40, M21.4)

Save

Learn about ICD-10 coding for flat foot, including acquired and congenital forms. Understand documentation requirements, coding pitfalls, and billing considerations.

Also known as:

Pes PlanusFallen Arches

Related ICD-10 Code Ranges

Complete code families applicable to Flat Foot

M00-M99Primary Range

Diseases of the musculoskeletal system and connective tissue

→

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
M21.41	Acquired flat foot, right foot	Use when the patient has acquired flat foot affecting the right foot.	Documentation of acquired status Radiographic evidence of medial arch collapse
M21.42	Acquired flat foot, left foot	Use when the patient has acquired flat foot affecting the left foot.	Documentation of acquired status Radiographic evidence of medial arch collapse
Q66.52	Congenital rigid flat foot, left foot	Use for congenital flat foot present since birth.	Documentation of congenital status Presence since childhood

Primary ICD-10-CM Codes

Flat foot [pes planus] (acquired), right foot

M21.41Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Congenital rigid flat foot, left footQ66.52

Acquired flat foot, left footM21.42

Documentation & Coding Risks

Avoid these common issues when documenting Flat Foot.

Omitting laterality in documentation.

Impact

Clinical: Inaccurate treatment planning., Regulatory: Non-compliance with coding standards., Financial: Potential claim denials or delays.

Mitigation

Always document laterality in the clinical note., Cross-check imaging reports for laterality.

Using unspecified laterality codes when laterality is documented.

Impact

Reimbursement: Claims may be denied or delayed., Compliance: Non-compliance with ICD-10 specificity requirements., Data Quality: Decreased accuracy in patient records.

Mitigation

Always use specific laterality codes (M21.41 or M21.42) when possible.

Confusing acquired flat foot with congenital flat foot.

Impact

Reimbursement: Incorrect coding can lead to claim denials., Compliance: Failure to adhere to coding guidelines., Data Quality: Inaccurate clinical data affecting patient care.

Mitigation

Verify patient history and documentation to determine if the condition is acquired or congenital.

Laterality documentation

Impact

Failure to document laterality can lead to audit flags.

Mitigation

Ensure all clinical notes and imaging reports specify laterality.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with M21.41.

Primary Code

M21.41

Flat foot [pes planus] (acquired), right foot

Quick Navigation

ICD-10 codes6

Coding risks4

FAQs2

ICD-10 Coding for Flat Foot(M21.41, E11.40, M21.4)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for acquired flat foot?

How do you differentiate between acquired and congenital flat foot?

Related condition guides