What Chiropractors Need to Know About the October 1, 2026 ICD-10 Code Updates

Every year on October 1st, the official ICD-10-CM diagnosis code set updates nationwide. For chiropractic practices, staying ahead of these coding revisions is essential to prevent billing delays, claim denials, and administrative headaches.

While core primary subluxation codes remain unchanged, several secondary diagnoses commonly billed for supportive care, soft-tissue work, and extremity adjustments are being deleted, expanded, or restructured.

Detailed Breakdown of Key ICD-10 Changes

The Centers for Medicare & Medicaid Services (CMS) has targeted several secondary diagnostic categories to enforce greater anatomical specificity and resolve overlapping codes.

1. Plantar Fasciitis (Dedicated New Subcategory)

• The Background: Historically, plantar fasciitis was reported under M72.2 (plantar fascial fibromatosis)—a separate fibrotic condition that was used out of convenience.

• What’s Changing: The code set formally separates these two pathologies. Plantar fasciitis now has its own dedicated subcategory, M67.A, which requires documenting laterality:

  • M67.A01 – Plantar fasciitis, right foot

  • M67.A02 – Plantar fasciitis, left foot

  • M67.A09 – Plantar fasciitis, unspecified foot

    
    

2. Plantar Fascial Fibromatosis (Base Code Deletion & Expansion)

• The Background: Because M72.2 previously served double duty, the unspecific base code M72.2 has been inactivated and deleted.

• What’s Changing: To bill true plantar fascial fibromatosis, providers must choose from three new site-specific options:

  • M72.21 – Plantar fascial fibromatosis, right foot

  • M72.22 – Plantar fascial fibromatosis, left foot

  • M72.20 – Plantar fascial fibromatosis, unspecified foot

    
    

3. Sternoclavicular Joint Sprain Family (Deletion)

• The Background: Sternoclavicular joint sprains previously existed under thorax codes (S23.420 series), creating long-standing overlap with shoulder region coding (S43.2/S43.6 series).

• What’s Changing: The entire S23.420 code family has been deleted:

  • Inactivated codes include S23.420A (initial encounter), S23.420D (subsequent encounter), and S23.420S (sequela).

  • Sternoclavicular complaints must now crosswalk to laterality-specific shoulder codes (such as the S43.6 series). Any claim carrying a deleted S23.420 code for a date of service on or after October 1st will be rejected immediately by payers.

    
    

4. Soft Tissue & Musculoskeletal Expansions (M79.8 Series)

• The Background: Broad, unspecified soft-tissue codes are being systematically retired across Chapter 13 of the code book.

• What’s Changing: Generalized codes in the M79.8X family are expanding to require right vs. left laterality indicators (e.g., distinguishing right vs. left shoulder or upper arm soft-tissue conditions).

  
  

Key Steps for Your Office Before October 1

Because deleted codes result in outright claim rejections rather than automatic down coding, taking time to review your internal workflows will protect your practice's cash flow:

1. Audit Saved Favorites & Macro Lists: Check your software’s custom diagnosis favorites, superbills, macro pick-lists, or encounter templates.

2. Remove Inactive Codes: Clear out deleted codes—specifically base M72.2 and the S23.420 sprain family—to prevent accidental selection.

3. Add New Laterality Codes: Replace them with the new specific codes (M67.A01/02 for plantar fasciitis, M72.21/22 for fibromatosis, and shoulder crosswalks like S43.61/62 for sternoclavicular joints).

4. Brief Treating Providers on Documentation: Remind clinicians that clinical notes for extremity and soft-tissue cases must explicitly document right vs. left side, as billing staff cannot assign laterality codes without clinical support in the record.

A Little Preparation Goes a Long Way Adapting to ICD-10 updates doesn't have to cause a dip in revenue. By scheduling a quick 10-minute cleanup of your favorite diagnosis lists and verifying that clinical documentation includes clear laterality, your practice can head into October 1st with complete confidence and zero interrupted cash flow.

Sources:

• Centers for Medicare & Medicaid Services (CMS): FY 2027 ICD-10-CM Code Files & Addenda https://www.cms.gov/medicare/coding-billing/icd-10-codes

• Centers for Disease Control and Prevention (CDC) / NCHS: ICD-10-CM Official Guidelines for Coding and Reporting (FY 2027) https://www.cdc.gov/nchs/icd/icd-10-cm/files.html