Skip to content

Conditions Browse codes

Index tables

Neoplasm tableCode a tumor by site and behavior Table of Drugs and ChemicalsPoisoning, adverse effect, underdosing

Tools

Batch code checkerPaste a list, see what is no longer billable Compare codesExcludes1 pairs side by side FY2027 changes190 new codes, 15 no longer billable

Search ICD-10-CM codes/

MenuClose

Find a code

Conditions A–Z Browse ICD-10-CM Neoplasm table Table of Drugs and Chemicals

Tools

Batch code checker Compare codes FY2027 changes

Learn

Coding guides Blog Data sources About

Display

ICD-10-CM/Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

R99

Ill-defined and unknown cause of mortality (R99) (R99)

R99 contains 1 categories and 1 ICD-10-CM codes for FY2027.

R99Ill-defined and unknown cause of mortality1 billable

Every ICD-10-CM code, and whether you can actually bill it

Built directly from the official ICD-10-CM FY2027 release published by the CDC / National Center for Health Statistics and CMS.

FY2027 codes are valid for encounters from October 1, 2026 through September 30, 2027.

Ask AI about ICDcodes.org

Machine-readable resources for AI assistants and LLM-based search to reference ICD-10-CM information from this site.

llms.txt →Full AI content →

Common ICD-10 lookups

Atrial fibrillation (AFib)
Chronic obstructive pulmonary disease (COPD)
Congestive heart failure (CHF)
Gastroesophageal reflux disease (GERD)
Hip pain
Hypertension
Knee pain
Low back pain (LBP)
Shoulder pain
Stroke
Type 2 diabetes (T2DM)
Urinary tract infection (UTI)
All conditions A–Z →

Coding guides

Billable vs Non-Billable ICD-10 Codes Explained
Excludes1 vs Excludes2 in ICD-10-CM: The Difference
Unspecified codes and denial risk
ICD-10-CM 7th Characters (A, D, S) and Placeholder X
Code first, use additional code, and code also
The ICD-10-CM update cycle
FY2027 updates
Blog

Tools

Browse ICD-10-CM codes
Batch code checker
Compare codes
Neoplasm table
Table of Drugs and Chemicals

About & trust

About
Editorial policy
Data sources
Changelog
Contact
Report an error
HTML sitemap

Not medical or billing advice. This site reproduces the ICD-10-CM classification for reference. Code selection must be based on the provider’s documentation and the ICD-10-CM Official Guidelines for Coding and Reporting. Verify against payer policy before submitting a claim. ICDcodes.org is not affiliated with CMS, CDC or NCHS.

© 2026 ICDcodes.org · ICD-10-CM is a work of the U.S. Government and is in the public domain.

Disclaimer
Privacy
Terms