ICD-10-CM
ICD-10 code for Problem (with) (related to) illiteracy: Z55.0
The ICD-10-CM index points "Problem (with) (related to) illiteracy" to Z55.0, Illiteracy and low-level literacy. Z55.0 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in Z55
A header groups codes and is not billed. A billable code is one you can report.
- Z55Problems related to education and literacyHeader
- Z55.0Illiteracy and low-level literacyBillable
- Z55.1Schooling unavailable and unattainableBillable
- Z55.2Failed school examinationsBillable
- Z55.3Underachievement in schoolBillable
- Z55.4Educational maladjustment and discord with teachers and classmatesBillable
- Z55.5Less than a high school diplomaBillable
- Z55.6Problems related to health literacyBillable
- Z55.8Other problems related to education and literacyBillable
- Z55.9Problems related to education and literacy, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
From Z55. A note on a category applies to every code under it.
Related pages
- Z55.0 code detailsNotes, nearby codes, CMS-HCC group
- Category Z55Every code under it
- Chapter 21Factors influencing health status
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Problem (with) (related to) illiteracy?
The ICD-10-CM index points "Problem (with) (related to) illiteracy" to Z55.0, Illiteracy and low-level literacy. Z55.0 is a billable code.
Is Z55.0 billable?
Yes. Z55.0 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to Z55.0?
The CDC tabular list gives 1 Excludes1 note (not coded together) for Z55.0 and the categories above it. They are listed on this page.
What chapter is Z55.0 in?
Chapter 21. Factors influencing health status.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.