Can I code directly from the FY2027 Table of Drugs and Chemicals?

No. The FY2027 ICD-10-CM Official Guidelines, section I.C.19.e.1, state the boundary directly: do not code from the Table of Drugs and Chemicals alone; return to the Tabular List. The table is a part of the U.S. ICD-10-CM Alphabetic Index, as section I.A.1 of those guidelines explains. It helps locate a possible entry for a documented substance and event, while the Tabular List supplies the complete classification context.

This guide concerns the FY2027 diagnosis release. CDC/NCHS says that release applies to healthcare services from October 1, 2026 through September 30, 2027, subject to later official updates. It does not decide whether an event is poisoning, an adverse effect or underdosing in an individual record. Those distinctions require the documentation and qualified human coding review.

The CDC/NCHS FY2027 Table and Index archive contains separately named Drug Table PDF and XML files along with the Tabular List and other Index components. The released Drug Table XML identifies itself as version 2027. The CMS ICD-10 files page lists this under ICD-10-CM diagnosis materials, separately from ICD-10-PCS procedure files. If a saved table has no fiscal-year label, identify its source and release before using it.

The versioned FY2027 Drug Table reference and FY2027 source library make that source family easier to navigate. For the original files and any subsequent revision, use the CDC/NCHS release page. The CDC/NCHS browser information also describes choosing a fiscal-year update and moving between Index and Tabular views.

The FY2027 released table labels a substance column, four poisoning columns distinguished by intent, an adverse-effect column, and an underdosing column. That layout is a navigation aid; similar-looking entries in different columns reflect different documented circumstances. The table cannot establish those circumstances merely because a substance appears in a row. Do not choose an intent, reaction type or “undetermined” branch from a search phrase, a medication list, or this article.

The official Chapter 19 guidance, section I.C.19.e, addresses adverse effects, poisoning, underdosing and toxic effects, including their distinct rules and sequencing. A reader reviewing a real encounter must use that complete section together with the record and the Tabular List. The table's cell is not a clinical finding, and a dash is not permission to improvise another code. When the documentation does not resolve the needed context, seek qualified clarification rather than manufacture it.

1. Label the release. Record “U.S. FY2027 ICD-10-CM” and the applicable service period from CDC/NCHS.
2. Identify documented context. A qualified reviewer establishes the substance and event details from the actual record. The table does not supply missing documentation.
3. Locate the Index route. Use the relevant substance entry and only the column supported by that documentation in the released Drug Table. Treat the result as a candidate.
4. Verify the full Tabular entry. Check the complete description, required characters, parent and category notes, exclusions and other applicable instructions. Guideline I.C.19.e.1 expressly requires this return to the Tabular List.
5. Apply the relevant Chapter 19 rule. Review the applicable subsection of I.C.19.e, plus any setting-specific instructions, before a qualified person makes a case-specific assignment.

Diagram-ready takeaway: documented substance and event → FY2027 Drug Table route and supported column → complete Tabular entry → applicable Chapter 19 guideline. It is a way to preserve the evidence trail, not an automatic code-selection algorithm.

Our FY2027 source-file map tells you which release component to open for a general question. This guide addresses the specific boundary after a Drug Table lookup: the table cell still needs Tabular verification. The Index and Tabular List guide explains the broader rule, while the parent-note guide shows why a leaf result may omit instructions above it. The Neoplasm Table guide is about a different Index component and does not provide drug-event guidance.

A copied table reference without its release, column context, full Tabular entry and applicable guideline can mislead the next reader. Keep those pieces together in any review note. This educational source path does not interpret a patient's medication event, select a code, or predict reimbursement.

ICD Code Hub's Android, iPhone and Mac apps offer available versioned reference routes; the shared app links below lead to the current store listings. When moving a lookup between devices, retain the fiscal year and the official source link. For the authoritative table files and effective period, return to CDC/NCHS; for the verification rule, read the FY2027 Official Guidelines.