New Unspecified Diagnosis Codes Excluded by CMS for 2017

by Experian Health 2 min read August 9, 2016

On May 26, Centers for Medicare & Medicaid Services (CMS) outlined additional unspecified diagnosis codes the agency is excluding from both ICD-9 and ICD-10 reporting beginning January 2, 2017.

The technical alert states the codes, “will not be accepted in the in the Alleged Cause of Injury, Incident or Illness (Field 15) or in any ICD Diagnosis Code field starting with Field 18. Updates to previously submitted records using these excluded codes, will also be rejected.”

These additions and upcoming changes to the ICD-10 codeset underline the need for clinical documentation improvement and ICD-10 training, experts say, as code and rule freezes are lifted by the healthcare payment agency. ICD-10-CM will include 1900 new codes and several more changes and deletions. Attention to documentation quality will be paramount.

Impacts Workers’ Comp and Auto

CMS writes that this change supersedes the applicable language in the MMSEA Section 111 Medicare Secondary Payer Mandatory Reporting Liability Insurance (Including Self-Insurance), No Fault Insurance, and Workers’ Compensation User Guide (Version 4.9).

The following ICD-9-CM will be added to the list of excluded diagnosis codes:

  • 999.9 (Other and unspecified complications of medical care, not elsewhere classified)

The following ICD-10-CM will be added to the list of excluded diagnosis codes:

  • T88.7XXA (Unspecified adverse effect of drug or medicament, initial encounter)
  • T88.7XXD (Unspecified adverse effect of drug or medicament, subsequent encounter)
  • T88.7XXS (Unspecified adverse effect of drug or medicament, sequela)
  • T88.8XXA (Other specified complications of surgical and medical care, not elsewhere classified, initial encounter)
  • T88.8XXD (Other specified complications of surgical and medical care, not elsewhere classified, subsequent encounter)
  • T88.8XXS (Other specified complications of surgical and medical care, not elsewhere classified, sequela)
  • T88.9XXA (Complication of surgical and medical care, unspecified, initial encounter) ·
  • T88.9XXD (Complication of surgical and medical care, unspecified, subsequent encounter)
  • T88.9XXS (Complication of surgical and medical care, unspecified, sequela)

Read the Technical Alert here: https://www.cms.gov/Medicare/Coordination-of-Benefits-and-Recovery/Mandatory-Insurer-Reporting-For-Non-Group-Health-Plans/Downloads/New-Downloads/Technical-Alert-New-Excluded-Diagnosis-Codes.pdf

Related Posts

Using AI in claims processing for healthcare

While automation has helped with more efficient claims processing, learn how AI can help with higher rates of reimbursement.

August 24, 2026 by Experian Health
How automation can reduce administrative costs in healthcare

Automation can reduce errors and streamline workflows and cashflow. Learn about 5 ways it can reduce administrative costs in healthcare.

August 18, 2026 by Experian Health
Common patient registration errors that cause revenue leakage

Patient registration errors can lead to claim denials, reimbursement delays and lost revenue. Learn common registration mistakes and how healthcare organizations can improve accuracy at the front end of the revenue cycle.

August 10, 2026 by Experian Health

Subscribe to our blog

Enter your name and email for the latest updates.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Subscribe to the Experian Health blog

Get the latest industry news and updates!
Subscribe