- 190 new codes, 30 deleted codes, and four revised codes take effect October 1, 2026.
- Codes apply to encounters from October 1, 2026, through September 30, 2027.
- Deleted codes pose the highest short-term risk if systems aren’t updated.
- Hospital medicine and primary care face the broadest operational impact.
- Train providers on documentation; coders, CDI, and billers on codes and claims.
- Monitor claims after October 1 to catch documentation gaps before they cause denials.
TL;DR
Don't wait until October to prepare. Review the FY 2027 ICD-10-CM changes now, prioritize specialty-specific training over trying to learn all 190 updates, and confirm your EHR, documentation templates, and billing workflows are ready before the October 1, 2026, deadline so claims keep moving without disruption.
The FY 2027 International Classification of Diseases, 10th revision, Clinical Modification (ICD-10-CM) diagnosis code update takes effect on October 1, 2026, bringing 190 new diagnosis codes, 30 deleted codes, and four revised codes for patient encounters and discharges through September 30, 2027. Waiting until the last minute to prepare for these changes can lead to coding errors, claim denials, reimbursement delays, and unnecessary administrative burden. Now is the time for private practices to review the FY 2027 ICD-10-CM diagnosis code changes, educate providers and staff, and update clinical and billing workflows to ensure a smooth transition.
What are some of the most impactful changes included in the FY 2027 ICD-10-CM diagnosis code update?
Given the sheer volume of changes each year, it’s impossible to cover everything. However, we’ve provided highlights of some of the changes that may impact multiple specialties. Medical practices can review the 2027 Addendum (available in the 2027 ICD-10-CM files) in its entirety to understand all FY 2027 ICD-10-CM diagnosis code additions, revisions, and deletions that may be relevant to specific patient populations.
| Coding change | Key FY 2027 codes | Why it matters | Specialties affected |
|---|---|---|---|
| More specific secondary malignant neoplasm coding | C78.31, C78.32, C79.83 and related new metastatic cancer codes | Replaces less-specific metastatic cancer coding with site-specific diagnoses, requiring more precise provider documentation. | Oncology, hospital medicine, internal medicine, surgery, pulmonology, gastroenterology, primary care |
| New personal history of gender transition codes | Z87.8901–Z87.8909 and Z87.893 | Distinguishes a patient’s history of gender transition (and detransition) from an active diagnosis, improving clinical documentation and coding accuracy. | Primary care, endocrinology, gynecology, urology, behavioral health, hospital medicine |
| Expanded adult BMI coding | Z68.18, Z68.19 | Adds greater specificity for documenting adult BMI values, supporting preventive care, chronic disease management, and quality reporting. | Primary care, endocrinology, bariatrics, nutrition, geriatrics, hospital medicine |
| Greater specificity for common conditions | J34.830–J34.839 (odontogenic sinusitis); M67.A01, M67.A02, M67.A09 (plantar fasciitis); M72.20–M72.22 (plantar fascial fibromatosis) | New code families capture anatomic site and laterality more accurately than previous codes. | ENT, podiatry, orthopedics, sports medicine, primary care, hospital medicine |
| New inherited disease and cancer predisposition codes | New code families for inherited neoplasm predisposition syndromes and related genetic conditions | Supports more precise documentation of inherited cancer risk and genetic disorders that influence screening, surveillance, and treatment planning. | Primary care, oncology, gastroenterology, genetics, obstetrics/gynecology |
The FY 2027 ICD-10-CM diagnosis code update also includes new specialty-specific codes for diagnoses such as:
- Continuing pregnancy after vanishing twin syndrome
- Dilated cardiomyopathy
- Ectopic pregnancies that add site specificity
- Other osteomyelitis
- Other specified cardiac arrhythmias
- Postprocedural hypoglycemia following a procedure
- Secondary malignant neoplasm of respiratory organs as well as the oral cavity
- …And More
What are the best strategies to educate providers and staff about these changes?
The most effective strategy is to provide targeted, role-based education before the October 1 implementation date. However, rather than asking everyone to learn all 190 new codes, organizations should focus on the changes that are most relevant to each specialty and job function. Providers should learn new documentation requirements, while coders, CDI specialists, and billers should focus on ICD-10-CM diagnosis code assignment, guideline changes (Note: Be sure to review the FY 2027 ICD-10-CM guidelines), and reimbursement implications.
To ensure compliance, combine the following:
- Collaboration between providers and coding teams
- Ongoing feedback
- Real-world documentation examples
- Specialty-specific education
Here’s a five-step training action plan to implement the ICD-10-CM diagnosis code updates.
| Strategy | Action step |
|---|---|
| 1. Prioritize specialty-specific education | Focus training on the diagnoses and documentation changes each specialty is most likely to encounter rather than reviewing the entire FY 2027 diagnosis code set. Pay attention to new codes, revised codes, and deleted codes. Deleted codes pose the highest short-term financial risk because outdated codes or improperly configured systems can immediately disrupt claims processing after October 1. |
| 2. Tailor education by role | Train physicians on documentation requirements, coders on code assignment and guideline updates, CDI specialists on documentation improvement opportunities, and billers on claim edits and payer impacts. |
| 3. Use real-world coding scenarios | Incorporate case studies that demonstrate how documentation supports the new FY 2027 ICD-10-CM diagnosis codes and highlight common coding and documentation pitfalls. |
| 4. Reinforce learning with practical resources | Develop specialty-specific tip sheets, documentation checklists, quick-reference guides, and EHR prompts that providers can use during patient encounters. |
| 5. Monitor performance and provide ongoing feedback | Audit documentation and coding after implementation, share findings with providers and staff, and offer refresher education to address recurring documentation gaps or coding errors. |
Consider the following FY 2027 ICD-10-CM diagnosis code training scenario followed by suggestions for role-specific education:
A 67-year-old patient with a history of breast cancer presents with progressive hoarseness and difficulty swallowing. Imaging confirms a secondary malignant neoplasm of the larynx. The medical record also documents a personal history of gender transition and an adult BMI of 18.5.
Under the ICD-10-CM diagnosis code update, the encounter may include the following diagnosis codes (as clinically appropriate):
- C78.31: Secondary malignant neoplasm of larynx
- Z87.8901–Z87.8903: Personal history of gender transition (select the code that matches the documented history)
- Z68.19: Adult BMI 18.5–18.9
Here’s what role-based training for this specific scenario might look like:
Physician training focus
Document the exact metastatic site rather than simply “metastatic cancer.” Clearly distinguish the patient’s personal history of gender transition from an active diagnosis, specify details of the gender transition, and ensure BMI is documented when clinically appropriate.
Coder training focus
Verify that provider documentation supports assignment of C78.31, the appropriate Z87.890x history code, and Z68.19. Query the provider if the metastatic site, history of gender transition, or BMI documentation is incomplete or ambiguous.
CDI specialist training focus
Review the record for documentation gaps before coding. Educate providers on documenting metastatic disease with site-specific detail, distinguishing active conditions from personal history, and capturing BMI when clinically relevant to reduce future queries.
Billing and revenue cycle training focus
Confirm that the practice management system, encoder, and payer edits recognize the new FY 2027 diagnosis codes. Monitor claims for rejections or medical necessity edits involving these codes and share denial trends with coding and clinical teams.
What steps should practices take to update clinical and billing workflows?
Preparing for the FY 2027 ICD-10-CM diagnosis code update requires more than updating diagnosis codes — it also involves reviewing the clinical, coding, and billing workflows that support accurate documentation, clean claims, and timely reimbursement.
| Step | Impacted workflows | Action | Consequence of inaction |
|---|---|---|---|
| 1. Update your EHR and practice management system | Clinical documentation, diagnosis selection, coding, claim submission | Work with your technology vendors to install the FY 2027 ICD-10-CM diagnosis code updates, replace deleted codes, and update diagnosis pick lists, templates, and billing software. If you run a cloud-based system, much of this happens for you. | Your EHR hasn’t been updated to include the new Z68.18 code (adult BMI 18.4 or less), forcing staff to use an outdated, incomplete diagnosis code (Z68.1) and delaying claim submission until the system is corrected. |
| 2. Review clinical documentation workflows | Provider documentation, coding, CDI, charge capture | Update documentation templates and clinical prompts to capture the additional specificity required for diagnoses affected by the FY 2027 update. | A physician documents “metastatic head and neck cancer” but doesn’t specify that the metastasis is in the larynx, preventing the coder from assigning C78.31 without sending a documentation query. |
| 3. Review payer edits and billing rules | Claim edits, payer validation, clearinghouse processing, reimbursement | Confirm that payer-specific edits, medical necessity rules, and prior authorization workflows reflect the new diagnosis codes and any deleted code replacements. | A patient is referred to an ENT specialist for odontogenic sinusitis, and the coder correctly assigns one of the new J34.83- codes. However, the practice’s billing software or clearinghouse is still using pre-update diagnosis code edits and doesn’t recognize the new code as valid. The system rejects the claim before it reaches the payer, requiring staff to update the billing software or payer edit tables, correct the claim, and resubmit it—delaying reimbursement and increasing administrative work. |
| 4. Monitor claims and coding performance after implementation | Denial management, coding quality, revenue cycle analytics, provider feedback | During the first several weeks after October 1, track coding accuracy, first-pass claim acceptance rates, denial trends, and documentation issues. Watch your first-pass acceptance rate and denial trends closely in the first few weeks. Tebra's practice management reporting and denials management tools flag rejected claims tied to invalid or deleted codes, so you can fix the mapping before denials pile up. | Within the first month after implementation, the practice notices an increase in denials involving the new Z68.18 and Z68.19 adult BMI codes. A review shows providers aren’t consistently documenting BMI in the medical record, allowing the practice to provide targeted education and reduce future denials. |
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