ICD-10-CM Tag Lists · FY 2027 19 Lists

2027 ICD-10-CM Code Lists by Tag ICD-10-CM

Tag lists cut across the chapter hierarchy and group ICD-10-CM codes by the questions coders actually ask: is it billable, what encounter character does it take, what poisoning intent applies, what neoplasm behavior was documented. Each list below is curated from the official FY 2027 dataset and links every code group to its place in the tabular index.

✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
19
Tag Lists
98,403
Codes Indexed
74,879
Billable Codes
FY 2027
Dataset
Billing Status
74,879Billable Codesthe FY 2027 billable ICD-10-CM codes valid for HIPAA claims, organized by code block with links to every complete list.23,524Non-Billable Codesthe FY 2027 non-billable ICD-10-CM header codes that need additional characters before they are valid for HIPAA claims.
Encounter Type (7th Character)
14,591Initial EncounterFY 2027 initial encounter ICD-10-CM codes (7th character A) for documenting active treatment, organized by code block.22,209Subsequent EncounterFY 2027 subsequent encounter ICD-10-CM codes (7th character D) for follow-up care during recovery, organized by code block.12,524SequelaFY 2027 sequela ICD-10-CM codes (7th character S) for chronic and residual conditions from past injuries or illnesses.51,3787th Character Codesevery FY 2027 ICD-10-CM code that requires a 7th character to report the encounter as initial, subsequent, or sequela.
Specificity
29,214Unspecified CodesFY 2027 unspecified ICD-10-CM codes, used when patient records lack the detail for a more specific diagnosis.
Table of Drugs and Chemicals
318Accidental PoisoningAll FY 2027 accidental poisoning ICD-10-CM codes with the substances that map to each code, searchable by drug name.318Intentional PoisoningAll FY 2027 intentional self-harm poisoning ICD-10-CM codes with the substances that map to each code, searchable by drug name.318Assault PoisoningAll FY 2027 assault poisoning ICD-10-CM codes for poisonings inflicted by another person, with the substances that map to each code.319Undetermined PoisoningAll FY 2027 undetermined intent poisoning ICD-10-CM codes, used when documentation cannot establish intent, searchable by substance.175Adverse EffectsAll FY 2027 adverse effect ICD-10-CM codes for harmful reactions to drugs taken as prescribed, searchable by substance.175UnderdosingAll FY 2027 underdosing ICD-10-CM codes for patients taking less medication than prescribed, searchable by substance.
Table of Neoplasms
364Primary Malignant NeoplasmsAll FY 2027 primary malignant neoplasm ICD-10-CM codes for cancers coded at their site of origin, searchable by anatomical site.40Secondary Malignant NeoplasmsAll FY 2027 secondary malignant neoplasm ICD-10-CM codes for metastatic cancer sites, searchable by anatomical site.58Carcinoma In SituAll FY 2027 carcinoma in situ ICD-10-CM codes for early-stage, non-invasive cancers, searchable by anatomical site.137Benign NeoplasmsAll FY 2027 benign neoplasm ICD-10-CM codes for non-cancerous tumors and growths, searchable by anatomical site.69Uncertain BehaviorAll FY 2027 ICD-10-CM codes for neoplasms of uncertain behavior, used when malignancy cannot be confirmed, searchable by site.12Unspecified BehaviorAll FY 2027 ICD-10-CM codes for neoplasms of unspecified behavior, used when the record lacks behavior detail, searchable by site.

Questions About This Page

What is a tag list?

A tag list collects every ICD-10-CM code that shares one coding property, no matter which chapter it lives in. The billable list spans all 22 chapters; the intentional poisoning list collects the self-harm codes of the Table of Drugs and Chemicals.

How are large lists organized?

Lists with thousands of codes are grouped by code block. Each group shows its count and links straight to the block's page in the tabular index, which lists every code with full detail.

Related References

Table of Drugs and ChemicalsTable of NeoplasmsICD-10-CM Codes ListICD-10-CM Code Lookup

Source: official CMS FY 2027 ICD-10-CM release, effective October 1, 2026 through September 30, 2027.