ICD-10 Updates 10/1/2026

As we approach the new code year on October 1, 2026 (FY2027), please be aware of several key ICD-10-CM code updates.

While core primary chiropractic subluxation/segmental dysfunction codes  and spinal disc/radiculopathy codes remain completely unchanged, there are critical structural revisions to secondary diagnostic codes, soft-tissue injuries, gait abnormalities, comorbidities, and lifestyle indicators commonly documented in our offices.

Below is the detailed breakdown of the specific codes, their new structures, and their clinical/billing implications. Using deleted codes on or after October 1 will result in immediate claim rejections.

Detailed Breakdown of FY2027 Code Changes

1. Plantar Fasciitis (M67.A Subcategory)

• Historically, plantar fasciitis was reported using M72.2 (plantar fascial fibromatosis) out of administrative convention. The FY2027 update moves plantar fasciitis into Chapter 13 under Disorders of Synovium and Tendon (M65–M67), creating a dedicated subcategory enforcing laterality:
• M67.A01 – Plantar fasciitis, right foot
• M67.A02 – Plantar fasciitis, left foot
• M67.A09 – Plantar fasciitis, unspecified foot

Clinical & Billing Impact: M67.A carries an Excludes1 note with foot pain (M79.67-). Once a definitive diagnosis of plantar fasciitis is documented, report M67.A- instead of generic symptom codes. Payers require laterality (M67.A01 or M67.A02) to justify physical therapy, custom orthotics, shockwave therapy, or therapeutic injections. Defaulting to M67.A09 risks clearinghouse edits or post-payment audits.

2. Plantar Fascial Fibromatosis (M72.2- Expanded Series)

• Because M72.2 previously served dual duty, the base code M72.2 has been deleted as a billable option and converted into a subcategory requiring 5th-character site specificity:
• M72.21 – Plantar fascial fibromatosis, right foot
• M72.22 – Plantar fascial fibromatosis, left foot
• M72.20 – Plantar fascial fibromatosis, unspecified foot

Clinical & Billing Impact: M72.2- applies only to true nodular thickening of the plantar fascia (Ledderhose disease). Using legacy M72.2 on or after October 1, 2026, will trigger immediate clearinghouse rejections.

3. Sternoclavicular Joint Sprains (S23.420- Deletion & Crosswalk)

• The thoracic sprain category S23.420 (S23.420A, S23.420D, S23.420S) has been deleted to eliminate classification overlap between thoracic trauma and shoulder girdle codes.
• Crosswalk Destination: Sternoclavicular joint sprains now crosswalk to the S43.6- series (Sprain of sternoclavicular joint/ligaments under Chapter 19 Shoulder Girdle).
• Billing Details: Requires 6th-character laterality (1 Right, 2 Left, 9 Unspecified) and a 7th-character encounter extension (A Initial, D Subsequent, S Sequela).

4. Osteomyelitis Expansion (M86.8X- Series)

• The M86.8X subcategory ("Other osteomyelitis") previously lacked laterality and detailed anatomical site characters. The update expands this family to require 6th-character site and laterality detail:
• M86.8X1 – Other osteomyelitis, shoulder (M86.8X11 right, M86.8X12 left)
• M86.8X2 – Other osteomyelitis, humerus
• M86.8X3 – Other osteomyelitis, forearm
• M86.8X4 – Other osteomyelitis, hand/fingers
• M86.8X5 – Other osteomyelitis, femur
• M86.8X6 – Other osteomyelitis, lower leg (tibia/fibula)
• M86.8X7 – Other osteomyelitis, ankle and foot
• M86.8X8 – Other osteomyelitis, other sites (includes skull, face, and pelvis)

Clinical & Billing Impact: While primary osteomyelitis care is outside standard chiropractic scope, documenting secondary history or active co-management requires complete code structure to avoid claim denials on co-managed diagnostic imaging or supportive care.

5. VEXAS Syndrome (M04.81 / M04.89 Subcategory)

• VEXAS syndrome (Vacuoles, E1 enzyme, X-linked, Autoinflammatory, Somatic) is a systemic autoinflammatory disorder caused by UBA1 mutations, presenting with inflammatory arthralgias, chondritis, skin lesions, and hematologic abnormalities.
• M04.81 – VEXAS syndrome
• M04.89 – Other autoinflammatory syndromes

Clinical & Billing Impact: Patients presenting with severe multi-joint arthralgias, recalcitrant costochondritis, or unexplained systemic inflammation who fail to respond to standard manual therapy should be evaluated or co-managed for underlying autoinflammatory disorders.

6. Gait & Mobility Abnormalities (R26 Updates)

Subcodes under R26 have been refined to allow higher specificity when reporting biomechanical instability, ataxia, and functional gait deficits:

• R26.0 – Ataxic gait
• R26.1 – Paralytic gait
• R26.2 – Difficulty in walking, not elsewhere classified
• R26.81 – Unsteadiness on feet
• R26.89 – Other abnormalities of gait and mobility
• R26.9 – Unspecified abnormalities of gait and mobility

Clinical & Billing Impact: Frequently used as supporting secondary diagnoses for custom orthotic evaluations, active rehabilitation (CPT 97110), neuromuscular re-education (CPT 97112), and fall-risk management protocols.

7. Post-Bariatric Hypoglycemia (E89.83- Subcategory)

1. A dedicated code subcategory has been established for post-procedural hyperinsulinemic hypoglycemia following bariatric surgery (e.g., Roux-en-Y gastric bypass or sleeve gastrectomy):
• E89.830 – Post bariatric hypoglycemia
• E89.838 – Other postprocedural hypoglycemia

Clinical & Billing Impact: Bariatric surgery patients often present for musculoskeletal complaints, postural re-education, or nutritional guidance. Identifying postprandial lightheadedness, tremors, or autonomic symptoms as E89.830 helps establish medical necessity for dietary counseling or metabolic co-management.

8. Underweight Adult BMI (Z68.18, Z68.19)

1. New granularity added to Chapter 21 (Factors influencing health status) to better classify adult low-BMI profiles:
• Z68.18 – Body mass index (BMI) 18.0–18.9, adult
• Z68.19 – Body mass index (BMI) 19.0–19.9, adult

Clinical & Billing Impact: Useful when documenting underlying nutritional risk, osteopenia/osteoporosis risk factors, or systemic frailty during comprehensive clinical evaluations.

9. Gender Transition & History Z-Codes (F64.A, Z87.890 Subcategory)

1. New codes were introduced to record a personal history of social, medical, or surgical gender transition, as well as gender detransition:
• Z87.890 – Personal history of sex reassignment / gender transition
• F64.A – Gender dysphoria in adolescence and adulthood (with sub-specifiers)

Clinical & Billing Impact: Ensures accurate historical health documentation for patients undergoing gender-affirming medical therapies (such as cross-sex hormone administration), which may influence bone mineral density, ligamentous laxity, or vascular risk profiles.

10. Personal History of Toxic & Environmental Hazard Exposure (Z77.- Expansion)

1. Expanded Z-codes to record past exposures to occupational, environmental, or military hazards:
• Z77.01- – Contact with and (suspected) exposure to hazardous aromatic amines, organic solvents, and industrial toxins
• Z77.1- – Environmental pollution and hazardous exposures (e.g., toxic military burn pits, contaminated water supplies)

Clinical & Billing Impact: Supports comprehensive intake history in personal injury, occupational health, or integrative medicine evaluations where toxic exposures contribute to systemic inflammation, peripheral neuropathies, or chronic pain syndromes.

Required Practice Action Items

• Clean Up Favorites & EHR Macros: Immediately scrub deleted codes (M72.2 base and the S23.420 thoracic sprain series) from EHR drop-down menus, saved macros, favorite shortcuts, and paper superbills to prevent immediate claim rejections.
• DELETED CODES TO REMOVE FROM EHR / SUPERBILLS IMMEDIATELY: Do NOT bill any of the following codes for services rendered on or after October 1, 2026: • M72.2 (Legacy Plantar Fascial Fibromatosis / Plantar Fasciitis catch-all) • S23.420A, S23.420D, S23.420S (Sternoclavicular joint sprains under Thorax)
• Audit Clinical Documentation for Laterality & Specificity: Verify that clinical notes explicitly record right vs. left side for foot and extremity complaints, as well as precise anatomical sites for osteomyelitis and gait impairment. Coders cannot infer laterality without explicit clinical support in the encounter note
• Date of Service (DOS) Enforcement: Remember that code updates apply strictly based on the Date of Service, not the claim submission date. Any service provided on or after October 1, 2026, must utilize the new code set.