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ICD-10-CM 2027 diagnosis code

W53.11XABitten by rat, initial encounter

✓ Billable / specificPOA exemptRequires 7th character

W53.11XA is a valid, billable ICD-10-CM code for bitten by rat, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About W53.11XA

W53.11XA is the ICD-10-CM diagnosis code for Bitten by rat, initial encounter. It belongs to category W53 (contact with rodent), block W50-W64 (exposure to animate mechanical forces) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as E906.1 (rat bite).

7th character

Ainitial encounter

Other encounter types for W53.11:

Notes that apply from higher levels

Instructions written at a parent level also apply to W53.11XA.

› From W53 Contact with rodent
Includes
  • contact with saliva, feces or urine of rodent

Broader instructions also apply from W50-W64 Exposure to animate mechanical forces and Chapter 20: External causes of morbidity.

ICD-9-CM equivalent

Converter →

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about W53.11XA

Is W53.11XA billable?

Yes. W53.11XA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of W53.11XA mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can W53.11XA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict W53.11XA as a principal diagnosis.

Is W53.11XA a CC or MCC?

No. W53.11XA is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for W53.11XA?

The CMS General Equivalence Mappings map W53.11XA to ICD-9-CM E906.1.