# Fast ICD-10-CM Hub (ICD Code Hub) — FY2027 Code Lookup

> An independent reference for the United States ICD-10-CM diagnosis-code classification, operated by Pluginfinity LLC.

The reference covers U.S. ICD-10-CM. Official titles and instructions remain in English; interface translations help users navigate the same U.S. catalog.
- [US ICD-10-CM FY2026](https://icd10codehub.com/en/icd10cm/2026-april): 2026-04-01 through 2026-09-30; tabular hierarchy, indexes and source files.
- [US ICD-10-CM FY2027](https://icd10codehub.com/en/icd10cm/2027): 2026-10-01 through 2027-09-30; tabular hierarchy, indexes and source files.

The website provides educational reference information. It does not diagnose conditions, determine a patient-specific code, or guarantee reimbursement. Original guides are separate from official classification text and have not been independently reviewed by a credentialed clinical coding specialist.

## Reference
- [Code lookup](https://icd10codehub.com/): Search the reference.
- [Complete FY2027 ICD-10-CM reference](https://icd10codehub.com/en/icd10cm/2027): Chapters, sections, categories and individual codes.
- [Alphabetic Index](https://icd10codehub.com/en/icd10cm/2027/index/diseases): Disease and injury terms.
- [External Causes Index](https://icd10codehub.com/en/icd10cm/2027/index/external-causes): External-cause terms.
- [Table of Drugs and Chemicals](https://icd10codehub.com/en/icd10cm/2027/index/drugs): Full labeled table contexts.
- [Neoplasm Table](https://icd10codehub.com/en/icd10cm/2027/index/neoplasms): Sites and behavior columns.
- [Sources and coding conventions](https://icd10codehub.com/en/icd10cm/2027/sources): Online guidelines, coding conventions and claims applicability.

## Common FY2027 code references
- [I10](https://icd10codehub.com/en/icd10cm/2027/sections/I10-I1A/I10): Official title, billable status and inherited coding instructions.
- [E11.9](https://icd10codehub.com/en/icd10cm/2027/sections/E08-E13/E11/E11.9): Official title, billable status and inherited coding instructions.
- [M54.50](https://icd10codehub.com/en/icd10cm/2027/sections/M50-M54/M54/M54.5/M54.50): Official title, billable status and inherited coding instructions.
- [F41.9](https://icd10codehub.com/en/icd10cm/2027/sections/F40-F48/F41/F41.9): Official title, billable status and inherited coding instructions.
- [K21.9](https://icd10codehub.com/en/icd10cm/2027/sections/K20-K31/K21/K21.9): Official title, billable status and inherited coding instructions.
- [N39.0](https://icd10codehub.com/en/icd10cm/2027/sections/N30-N39/N39/N39.0): Official title, billable status and inherited coding instructions.

## Educational guides
- [CDC ICD-10-CM Browser or FY2027 download: which should I use?](https://icd10codehub.com/blog/fy2027-cdc-browser-vs-download): Use CDC’s FY2027 browser for an interactive Index-to-Tabular lookup and the released files for an exact, reproducible source copy. Learn what to verify in either route.
- [Which FY2027 ICD-10-CM guidelines apply to outpatient visits?](https://icd10codehub.com/blog/fy2027-outpatient-guideline-section-iv): Start with Section IV for FY2027 outpatient diagnosis reporting, then read the applicable Section I conventions and full Index and Tabular entry.
- [Does “and” in a FY2027 ICD-10-CM code title require both terms?](https://icd10codehub.com/blog/fy2027-and-code-title-either-or-both): The FY2027 ICD-10-CM “and” convention can mean either term or both in a code title. Learn its limits and the Index-to-Tabular verification path.
- [Does “with” in FY2027 ICD-10-CM presume a relationship?](https://icd10codehub.com/blog/fy2027-with-in-convention-documentation-link): When FY2027 ICD-10-CM links conditions with “with” or “in,” learn what the convention presumes, its exceptions, and how to verify the full entry.
- [Brackets, parentheses, colons and commas in FY2027 ICD-10-CM: what do they mean?](https://icd10codehub.com/blog/fy2027-icd10cm-punctuation-index-tabular): FY2027 ICD-10-CM punctuation changes meaning by location. Read brackets, parentheses, colons and Index commas without skipping the full Tabular check.
- [Is an Alphabetic Index default code the final ICD-10-CM code?](https://icd10codehub.com/blog/fy2027-alphabetic-index-default-code-check): A FY2027 Index default is the main-term code when no added detail is documented. Check subterms and verify the full Tabular entry before using it.
- [“Includes” note or inclusion term? How to read FY2027 ICD-10-CM](https://icd10codehub.com/blog/fy2027-includes-note-vs-inclusion-terms): A FY2027 “Includes” note explains a three-character category; inclusion terms appear under some codes and are not exhaustive. Learn the full-entry check.
- [When is a three-character ICD-10-CM category a complete code?](https://icd10codehub.com/blog/fy2027-three-character-category-complete-code): A three-character FY2027 ICD-10-CM category is a complete code only when it has no further subdivision. Check the hierarchy and required characters.
- [If I switch languages, do FY2027 ICD-10-CM titles change?](https://icd10codehub.com/blog/fy2027-icd10cm-interface-language-source-title): The site interface can change language while FY2027 U.S. ICD-10-CM source titles stay in English. Learn how to verify and share the correct release.
- [Do saved ICD-10-CM codes stay current across devices?](https://icd10codehub.com/blog/saved-icd10cm-codes-across-devices-release-check): Saved codes can sync with one ICD Code Hub account. Learn what follows you across web, iPhone, Android and Mac, and how to recheck the FY2027 source.
- [Where does a FY2027 ICD-10-CM external-cause lookup start?](https://icd10codehub.com/blog/fy2027-external-cause-index-tabular-verification): Start with the documented event and FY2027 Alphabetic Index of External Causes, then verify the complete Tabular entry, required characters, and reporting rules.
- [How do I check whether my saved FY2027 ICD-10-CM file is current?](https://icd10codehub.com/blog/fy2027-icd10cm-saved-file-current-check): Check a saved FY2027 diagnosis file against the CDC/NCHS release page, exact package and effective period. Learn what a file date or SHA-256 comparison can—and cannot—prove.
- [Can I code directly from the FY2027 Table of Drugs and Chemicals?](https://icd10codehub.com/blog/fy2027-drug-table-tabular-verification): No. Follow the FY2027 ICD-10-CM Drug Table as an Index route, then verify the full Tabular List entry and applicable Chapter 19 guidance before any code decision.
- [Which FY2027 ICD-10-CM file should I open first?](https://icd10codehub.com/blog/fy2027-icd10cm-which-source-file): Match a FY2027 diagnosis-code question to the official Index, Tabular List, guidelines, addenda or code descriptions—and know which file must confirm the answer.
- [Where is the FY2027 ICD-10-CM Neoplasm Table?](https://icd10codehub.com/blog/fy2027-neoplasm-table-source-navigation): Find the official FY2027 Neoplasm Table in the ICD-10-CM Index, confirm the release period, and learn why a table reference needs full Tabular verification.
- [Does the FY2027 ERRATA change ICD-10-CM diagnosis codes?](https://icd10codehub.com/blog/fy2027-errata-pcs-vs-icd10cm-files): CMS lists a FY2027 ERRATA under ICD-10-PCS. Check what its PDF changes, then use CDC/NCHS FY2027 files to verify any ICD-10-CM diagnosis claim.
- [Where Did the FY2027 Chapter 1 Excludes Note Move?](https://icd10codehub.com/blog/fy2027-chapter-1-excludes2-addendum-check): The FY2027 Tabular addendum changes a Chapter 1 localized-infections note from Excludes1 to Excludes2. Verify the full released note before using it.
- [FY2027 ICD-10-CM laterality: bilateral or left and right?](https://icd10codehub.com/blog/fy2027-icd-10-cm-laterality-bilateral-unspecified): Learn when FY2027 ICD-10-CM uses a bilateral entry, separate left and right entries, or an unspecified side, and how to verify the full code.
- [Does the FY2027 ICD-10-CM conversion table choose today’s code?](https://icd10codehub.com/blog/fy2027-conversion-table-previous-assignment): The FY2027 ICD-10-CM conversion table links current and previous assignments. Learn the effective-year rule and why a full code lookup is still needed.
- [Does “code also” tell you which ICD-10-CM code goes first?](https://icd10codehub.com/blog/fy2027-code-also-note-sequencing): A FY2027 ICD-10-CM “code also” note may call for two codes but does not set their order. Learn how to check the full entry and other sequencing rules.
- [September 2026 ICD-10-CM proposals: are they in FY2027?](https://icd10codehub.com/blog/september-2026-icd-10-cm-proposals-vs-fy2027): A September 2026 committee topic is not automatically an active FY2027 diagnosis code. Check its proposal stage, planned 2027 date and released CDC/NCHS files.
- [When Must I Follow “See” or “See Also” in the FY2027 Index?](https://icd10codehub.com/blog/fy2027-see-vs-see-also-index): When must you follow an ICD-10-CM Index cross-reference? Compare “see” and “see also” in the FY2027 rules, then verify the result in the Tabular List.
- [What Does POA-Exempt Mean in FY2027 ICD-10-CM?](https://icd10codehub.com/blog/fy2027-poa-exempt-list-meaning): Does POA-exempt mean a condition was absent on admission? Use the FY2027 CMS list and Appendix I to distinguish an inapplicable POA indicator from Y, N, U and W.
- [Parent notes in FY2027 ICD-10-CM: a Tabular review path](https://icd10codehub.com/blog/fy2027-parent-tabular-notes-check): Learn where to look for chapter, category and subcategory instructions when checking a FY2027 ICD-10-CM code, and how to keep the note with its source.
- [Bold text in the FY2027 ICD-10-CM guidelines: does it mean a new code?](https://icd10codehub.com/blog/fy2027-guideline-bold-text-changes): Learn what bold, underlined and italic text marks in the FY2027 ICD-10-CM guidelines, then compare the current and prior editions without mistaking a guideline edit for a new code.
- [Combination codes in FY2027 ICD-10-CM: an Index-to-Tabular check](https://icd10codehub.com/blog/fy2027-combination-codes-lookup): Learn what a combination code covers, how to find one in the FY2027 ICD-10-CM Index and Tabular List, and when the official guideline calls for an additional code.
- [Other specified vs unspecified in FY2027 ICD-10-CM: NEC and NOS](https://icd10codehub.com/blog/fy2027-nec-nos-other-specified-unspecified): Understand the FY2027 ICD-10-CM meanings of “other specified,” “unspecified,” NEC and NOS, including the case where no unspecified code is provided.
- [How to read a FY2027 ICD-10-CM addendum revision: an E29.1 example](https://icd10codehub.com/blog/fy2027-addendum-revised-term-example): Follow one verified FY2027 Tabular List addendum entry from “Revise from” to the complete E29.1 reference, and learn what the change does and does not establish.
- [What do “code first” and “use additional code” mean in ICD-10-CM?](https://icd10codehub.com/blog/fy2027-code-first-use-additional-code): Read FY2027 ICD-10-CM sequencing notes in context: what “code first” and “use additional code” mean, when a second code is needed, and how to verify the full entry.
- [Which ICD-10-CM release applies across October 1, 2026?](https://icd10codehub.com/blog/fy2027-icd-10-cm-october-1-date-boundary): Use the FY2026 or FY2027 ICD-10-CM reference for a September 30 service, an October 1 encounter, or an inpatient discharge that crosses the changeover.
- [How Do I Review FY2027 ICD-10-CM Addenda?](https://icd10codehub.com/blog/fy2027-icd-10-cm-addenda-checklist): The FY2027 ICD-10-CM files apply from October 1, 2026. Learn how to review addenda, verify the full Tabular List, and record code changes.
- [How Should I Prepare for the FY2027 ICD-10-CM Release?](https://icd10codehub.com/blog/icd-10-cm-2027-release-guide): Prepare for FY2027 ICD-10-CM by checking the applicable date, official files, addenda and full Tabular instructions before updating saved references.
- [How Do You Use the FY2027 ICD-10-CM Index and Tabular List?](https://icd10codehub.com/blog/alphabetic-index-and-tabular-list): Start with the documented term in the FY2027 Alphabetic Index, follow its directions, then verify the complete code and inherited notes in the Tabular List.
- [Excludes1 vs Excludes2: What Is the Difference in ICD-10-CM?](https://icd10codehub.com/blog/excludes1-vs-excludes2): Excludes1 generally means do not report the excluded condition together; Excludes2 allows both when appropriate. Read the FY2027 exception and parent notes.
- [What Does FY2027 ICD-10-CM Code M54.50 Mean?](https://icd10codehub.com/blog/m54-50-low-back-pain-code): M54.50 is the FY2027 ICD-10-CM entry for low back pain, unspecified. Compare nearby entries and M54.5 category notes without inferring a diagnosis.
- [What Do Billable and Unspecified Mean in ICD-10-CM?](https://icd10codehub.com/blog/billable-specific-and-unspecified-codes): A billable label describes code completeness, not payment or patient fit. Learn how FY2027 categories, specific codes and unspecified entries differ.
- [What Do the Seventh Character and X Mean in ICD-10-CM?](https://icd10codehub.com/blog/seventh-characters-placeholder-x): Some FY2027 ICD-10-CM codes require a seventh character; placeholder X keeps it in position. Check the code family and what “initial encounter” means.

## Code-list checks and pricing
- [Check up to 100 codes](https://icd10codehub.com/en/code-validator): Catalog presence and code completeness; not clinical or reimbursement validation.
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## Apps
- [Fast ICD-10-CM Hub for iPhone](https://apps.apple.com/us/app/icd-code-hub/id6809254714): The official iPhone app on the App Store.
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## Primary source
- [CDC/NCHS ICD-10-CM files](https://www.cdc.gov/nchs/icd/icd-10-cm/files.html): Official US classification publisher.