The 2026 ICD-10 CM update, effective October 1, 2025, arrives with precision and momentum: hundreds of new and revised codes sharpen oncology, genetic risk, metabolic and emergency coding while new social determinants and remission designations change how patient context is captured and reimbursed.
Prepare for clearer documentation expectations, updated DRG impacts, and targeted queries that will directly affect clinical workflows, revenue capture, and quality reporting.
Summary of FY 2026 ICD-10-CM Updates
- Total new codes: 487
- Revised codes: 38
- Deleted/invalidated codes: 28
- Effective date: October 1, 2025
- Source: https://www.cms.gov/medicare/coding-billing/icd-10-codes
Key Changes by Chapter
| Chapter | New Codes | Specific Additions & Changes |
|---|---|---|
| Infectious & Parasitic Diseases | 2 | New codes for Demodex mite infestation (B88.1); HIV coding clarified with new sequencing rules and expanded use of B20, Z21, and R75. |
| Neoplasms | 3 | C50.A becomes parent for inflammatory breast cancer; Z15.06 for genetic susceptibility to digestive system neoplasms (e.g., colorectal cancer). |
| Blood & Immune Disorders | 3 | D71.- expanded for polymorphonuclear neutrophil disorders; new codes for leukocyte adhesion deficiency. |
| Endocrine, Nutritional & Metabolic | 23 | E11.A for Type 2 diabetes in remission; new codes for metabolic disorders including lipodystrophy and gene deficiencies; expanded codes for hyperoxaluria. |
| Nervous System | 10 | G35.- becomes parent for MS subtypes (e.g., relapsing-remitting); new code for primary progressive apraxia of speech. |
| Eye & Adnexa | 19 | H01.8 becomes parent for eyelid inflammation laterality; new codes for thyroid orbitopathy and neovascular glaucoma. |
| Circulatory System | 4 | Codes I27.840–I27.849 for Fontan associated conditions; hypertension guidelines with CKD and heart disease updates. |
| Skin & Subcutaneous Tissue | 116 | 112 new codes for chronic non-pressure ulcers by site and severity; new codes for cellulitis, furuncle, and acute lymphangitis of the flank. |
| Musculoskeletal System | 1 | M05.A for abnormal rheumatoid factor and anti-citrullinated protein antibody with RA; updated coding for multiple sites. |
| Genitourinary System | 5 | N07.B for hereditary nephropathy; new codes for acute nephritic syndrome with IC-MPGN and nephrotic syndrome. |
| Congenital Malformations | 23 | QA0.- new parent for neurodevelopmental disorders tied to genetic variants; new codes for Usher syndrome. |
| Symptoms & Clinical Findings | 21 | R11.16 for cannabis hyperemesis syndrome; R10.2- converted to parent for pelvic/perineal pain; several new pain and tenderness codes. |
| Injury & External Causes | 213 | Several new codes for injuries of abdominal wall/flank; T78.07- for anaphylaxis to milk with baked milk tolerance. |
| External Causes of Morbidity | 20 | New codes for fishing hook injuries, blast overpressure, and wood splitting activity. |
| Health Status & Services | 26 | Z59.86- parent for financial insecurity; Z91.011- milk allergy (parent); Z91.012- egg allergy (parent); codes for prophylactic fallopian tube removal. |
Key Changes by Specialty
| Specialty | Impact | Key Code Changes |
|---|---|---|
| Emergency Medicine | High volume of new injury codes, especially for flank injuries and toxic exposures. | 138 new flank injury codes (e.g., contusions, bites, lacerations); new codes for baked milk/egg tolerance and fishing hook injuries. |
| Dermatology | Major expansion in skin and ulcer codes. | 112 new codes for non-pressure chronic ulcers by site and severity; new codes for cellulitis and lymphangitis of the flank. |
| Endocrinology | New classification for diabetes and metabolic disorders. | E11.A for Type 2 diabetes in remission; new codes for lipodystrophy and gene deficiencies. |
| Neurology | Expanded classification for MS and speech disorders. | New MS phenotype codes (e.g., relapsing-remitting); primary progressive apraxia of speech. |
| Ophthalmology | New codes for eye diseases linked to systemic conditions. | Blepharitis (linked to Demodex mites); thyroid eye disease; neovascular glaucoma. |
| Oncology | Updates for inflammatory breast cancer and genetic susceptibility. | C50.A parent code for inflammatory breast neoplasm; Z15.06 for colorectal cancer susceptibility. |
| Nephrology | New codes for genetic kidney disease. | APOL1-mediated kidney disease (N07.B); Z codes for genetic susceptibility and family history. |
| Pediatrics & Genetics | New congenital and neurodevelopmental disorder codes. | 23 new codes for congenital syndromes; QA0.- for pathogenic variant-related disorders. |
| Primary Care & Family Medicine | Broader SDOH and symptom codes. | Z59.86 for financial insecurity; R11.16 for cannabis hyperemesis syndrome; expanded pain codes. |
| Obstetrics & Gynecology | Codes for prophylactic procedures and exposures. | Z90.721 for prophylactic fallopian tube removal; Z77.3 for exposure to Diethylstilbestrol (DES). |
| Immunology & Rheumatology | New codes for abnormal immune findings. | R76.89 for abnormal immunoglobulin levels; M05.A for abnormal rheumatoid factor. |
Bottom Line
The 2026 ICD-10 update enhances specificity and better aligns with clinical practice by refining terminology, expanding recognition of rare conditions, distinguishing remission states, and broadening SDoH code options. These changes support treatment-linked and population-level tracking, improving clinical documentation, quality measurement, and surveillance across health systems.
Stay ahead of every code change.
Book a consultation with Medikigai’s experts at notices@medikigai.com
to ensure your practice is fully ICD-10 compliant for 2026.
Dr. Abha Sharma, CPC, COC, CIC, AHIMA approved ICD-10 CM/PCS Trainer, Senior Vice President of Medical Coding and Client Services at Medikigai, brings years of expertise in guiding providers through the maze of payer rules. What started as a passion for helping fellow clinicians quickly grew into a career focused on turning complex regulations into clear, actionable strategies. From clinical documentation improvement to billing for emerging healthcare technologies, her mission is simple: make coding and insurance rules understandable and practical, so providers can focus on care while practices optimize revenue.
