2027 ICD-10-CM Inactive Codes: End-Date These by Oct 1

2027 ICD-10-CM Codes That Must Be Made Inactive Effective October 1, 2026

The FY 2027 ICD-10-CM code set takes effect October 1, 2026, with 190 new codes, 30 existing codes that will no longer be valid for FY 2027 reporting, and four revised descriptions. Healthcare organizations should update their coding systems, EHR favorites, claim edits, and billing workflows before implementation.

The affected codes should not be removed from billing or EHR systems. Instead, they should be end-dated September 30, 2026, and made inactive effective October 1, 2026. They must remain accessible for claims, corrections, appeals, and retrospective reporting based on dates before implementation.

Generally, outpatient and professional claims follow the date of service, while inpatient facility reporting follows the discharge date.

Which Codes Must Be Made Inactive?

The 30 affected codes span several important clinical areas.

Qualitative Platelet Disorders

Code becoming inactive: D69.1 — Qualitative platelet defects

Beginning October 1, D69.1 will no longer be reportable as a complete diagnosis code. More specific choices include:

D69.11: Glanzmann thrombasthenia
D69.19: Other qualitative platelet defects

Providers should document the specific platelet disorder when known rather than relying on a general diagnosis.

Cardiomyopathy and Arrhythmia Codes

Three commonly used cardiovascular codes will no longer be valid as complete reportable codes.

I42.0 — Dilated cardiomyopathy is expanded to:

I42.00: Dilated cardiomyopathy, unspecified
I42.01: Familial-genetic dilated cardiomyopathy
I42.09: Other dilated cardiomyopathy

I42.8 — Other cardiomyopathies is expanded to:

I42.81: Arrhythmogenic cardiomyopathy
I42.89: Other cardiomyopathies, not elsewhere classified

I49.8 — Other specified cardiac arrhythmias is expanded to:

I49.81: Brugada syndrome
I49.82: Ventricular bigeminy
I49.89: Other specified cardiac arrhythmias, not elsewhere classified

Coding teams should review the medical record rather than automatically selecting an unspecified replacement. Documentation must support the more specific diagnosis.

Plantar Fascial Fibromatosis and Plantar Fasciitis

Code becoming inactive: M72.2 — Plantar fascial fibromatosis

The new reportable codes identify laterality:

M72.20: Plantar fascial fibromatosis, unspecified foot
M72.21: Plantar fascial fibromatosis, right foot
M72.22: Plantar fascial fibromatosis, left foot

The update also creates dedicated codes for plantar fasciitis:

M67.A01: Plantar fasciitis, right foot
M67.A02: Plantar fasciitis, left foot
M67.A09: Plantar fasciitis, unspecified foot

This distinction matters because plantar fasciitis and plantar fascial fibromatosis are different conditions. Practices should not automatically crosswalk every historical use of M72.2 to the new M72.20–M72.22 family. The documented diagnosis must be reviewed first.

Osteomyelitis Codes Require Greater Specificity

Eight reportable codes in the M86.8X family must be made inactive:

M86.8X1: Shoulder
M86.8X2: Upper arm
M86.8X3: Forearm
M86.8X4: Hand
M86.8X5: Thigh
M86.8X6: Lower leg
M86.8X7: Ankle and foot
M86.8X8: Other site

The FY 2027 codes distinguish right, left, and unspecified locations. For example, M86.8X1 is expanded to:

M86.8X11: Right shoulder
M86.8X12: Left shoulder
M86.8X19: Unspecified shoulder

The former “other site” option is replaced by separate reportable codes for the skull, face and sinuses, and other sites. Providers should consistently document the anatomical location and laterality.

Sternoclavicular Joint Sprain Codes

The following codes must be made inactive:

S23.420A: Initial encounter
S23.420D: Subsequent encounter
S23.420S: Sequela

The FY 2027 code set does not provide a simple one-to-one replacement. Coders must review the diagnosis and anatomical documentation to determine the appropriate current code. An automatic crosswalk could produce an inaccurate result.

Toxic Effects of Organic Solvents

Twelve codes in the T52.8X family must be made inactive. These codes previously differentiated accidental exposure, intentional self-harm, assault, and undetermined intent, along with the applicable encounter character.

The new code structure distinguishes among:

T52.81-: Toxic effects of alkenes
T52.82-: Toxic effects of cycloparaffins
T52.89-: Toxic effects of other organic solvents

Documentation should identify the specific substance, intent, and encounter type. Because these codes do not have one universal replacement, organizations should avoid relying solely on automated crosswalks.

Adult BMI Codes

Code becoming inactive: Z68.1 — Body mass index 19.9 or less, adult

The new codes divide the previous BMI range into:

Z68.18: Adult BMI 18.4 or less
Z68.19: Adult BMI 18.5–19.9

This change affects primary care, nutrition, bariatric medicine, and other specialties that routinely report BMI. EHR calculations, diagnosis lists, and claim edits should be updated to select the appropriate code based on the documented BMI.

Personal History of Gender Transition

Code becoming inactive: Z87.890 — Personal history of sex reassignment

The FY 2027 code set provides more specific history codes for social, medical, and surgical gender transition, intersex surgery, unspecified gender transition, and gender detransition.

Organizations should update terminology, coding guidance, and privacy-sensitive documentation workflows. Code assignment must be supported by the medical record and relevant to the encounter.

October 1 Readiness Checklist

Before implementation, healthcare organizations should:

Set September 30, 2026, as the last valid reporting date for the 30 affected codes.
Make the codes inactive for applicable reporting dates beginning October 1, 2026.
Preserve the codes for historical claims, corrections, appeals, and retrospective reporting.
Load and test the complete FY 2027 code set.
Update EHR favorites, templates, and diagnosis pick lists.
Review automated crosswalks instead of assuming every inactive code has a direct replacement.
Update medical-necessity and claim-scrubber edits.
Educate providers about the new documentation requirements.
Test claims with clearinghouses and billing platforms.
Monitor rejections and denials closely after implementation.
Audit claims crossing the October 1 transition.

Prepare Now to Prevent Reimbursement Disruptions

ICD-10-CM implementation is more than a code-file update. Documentation templates, coding workflows, billing edits, and staff education must all work together to support accurate claims.

Organizations that wait until October often discover the gap through rejections and denials rather than through testing. The cost of that discovery is measured in delayed cash flow and rework, not in software licensing.