Billing guides that show their source
Guides on coding, denials, prior authorization and payer rules — each one written from the eCFR, the Federal Register and CMS’s own manuals, and each one naming the rule it relies on.
Newest first
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S23.420 Was Deleted With No Replacement. What to Code Instead.
By Danish William ·
The One FY 2027 Deletion With Nothing to Replace It Thirty ICD-10-CM codes stopped being billable on October 1, 2026. Twenty-seven of them split into…
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Z68.1 Is Gone: The BMI Code Split at 18.5 on October 1
By Eman Zahra ·
A BMI Code Nobody Thinks About Just Split in Two Z68.1 is one of the most quietly ubiquitous codes in the set. It attaches to…
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Plantar Fasciitis Moves Out of M72.2 into M67.A0 on October 1
By Danish William ·
The Most Commonly Miscoded Change in the FY 2027 Update M72.2 was deleted on October 1, 2026, and the obvious reading is that it gained…
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How to Code Medetomidine: New ICD-10 Codes T65.851 to T65.854
By Eman Zahra ·
What Changed on October 1, 2026 Medetomidine has been turning up in the illegal opioid supply since 2022, and until this month there was no…
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Lynch Syndrome and BRCA Get ICD-10 Codes: QA17 Does Not Replace Z15.09
By Eman Zahra ·
What Changed for Lynch Syndrome and BRCA on October 1, 2026 Until now, a patient with Lynch syndrome, a pathogenic BRCA1 or BRCA2 variant, or…
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ICD-10 I42.0 Deleted: What to Code for Dilated Cardiomyopathy (2027)
By Danish William ·
What Happened to ICD-10 Code I42.0? If a dilated cardiomyopathy claim for a date of service on or after October 1, 2026 comes back denied,…
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J9190 Ends September 30: 15 HCPCS Drug Codes and Their New Units
By Danish William ·
Fifteen Drug Codes End on September 30, 2026 The October 2026 quarterly update to HCPCS Level II terminates fifteen codes with a termination date of…
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38 ICD-10-PCS Codes Expire October 1, 2026 (Six Have No Replacement)
By Eman Zahra ·
Thirty-Eight Procedure Codes Expire on October 1, 2026 The FY 2027 ICD-10-PCS update is small on paper. CMS puts it at 101 new codes, 3…
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FY 2027 ICD-10 Coding Guidelines: What Actually Changed
By Sarah Callahan ·
Almost Nothing Changed, and Three Things People Will Tell You Changed Did Not Every year the ICD-10-CM Official Guidelines for Coding and Reporting are reissued…
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Modifier 25 & Same-Day Injections: 2026 Audit Guide
By Sarah Callahan ·
By Sarah Callahan — Reviewed by Eman Zahra — Last updated: August 2026 Educational disclaimer: This article is general educational content about Medicare coding and…