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General information about reading the United States tariff schedule; it is not customs, legal or medical advice.
Short answer
An HTS lookup means searching the Harmonized Tariff Schedule of the United States, published by the U.S. International Trade Commission (USITC), for the line that describes a product. A keyword search returns candidate lines, not a classification: the legal text, the General Rules of Interpretation (GRIs) and the importer’s own reasonable care decide the final code.
Definition and scope
The HTS (HTSUS) is the U.S. national tariff schedule built on the international Harmonized System (HS). According to the U.S. Customs and Border Protection (CBP) informed compliance publication on tariff classification, the 4-digit and 6-digit numbers belong to the international HS, the 8-digit number is part of the national HTSUS, and the legal text of the HTSUS extends only to the 8-digit level. Tariff-rate lines exist only at the 8-digit level. So “how to find an HS code” is answered by the first six digits of an HTS line, and “HTS code classification” is the act of choosing the correct line under the GRIs.
How an HTS search works in practice
The USITC search at hts.usitc.gov returns the schedule’s lines that match a keyword, listed in HTS-number order. Each returned row carries the same fields printed in the schedule:
- HTS number: 4-, 6- or 8-digit heading and subheading numbers, plus an optional two-digit statistical suffix.
- Article description: the wording that defines what falls in the line.
- Rate columns: General, Special and Other.
- Units: the unit of quantity, such as “No.” for number of items.
The 10-digit statistical-reporting number is built by adding two digits to the 8-digit legal line. CBP states that these suffixes are for collecting statistical data only and are not part of the legal text, so they cannot be cited as authority for a classification.
Worked example: the keyword “syringe”
A USITC search for the keyword “syringe”, checked on 2026-11-01 (release “2026 HTS Revision 22”, dated 10/26/2026, effective 10/30/2026), returned four lines, in three different chapters:
| HTS number | Chapter | Description as returned |
|---|---|---|
| 3926.90.21.00 | 39 | Ice bags, douche bags, enema bags, hot water bottles and similar articles, including “syringes (other than hypodermic syringes) and fittings therefor, not in part of glass or metal” |
| 9018.31.00 | 90 | “Syringes, with or without needles; parts and accessories thereof” |
| 9018.31.00.40 | 90 | Statistical suffix 40, “Hypodermic”, unit “No.” |
| 9903.91.10 | 99 | A provision for entries of enteral syringes of China within a stated date window that ended before January 1, 2026, referring to statistical reporting number 9018.31.0080 |
Three lessons follow. First, one everyday word lands in a plastics chapter, a medical-instruments chapter and a special-provisions chapter, so a hit is a candidate to read, not an answer. Second, 9018.31.00 is the 8-digit legal line and the .40 line is a statistical split of it. Third, the chapter 99 line appears beside a chapter 90 line because chapter 99 is where temporary modifications are recorded (see below). Rates are not repeated here because they change with each revision; read the current line in the search itself. For how such lines interact with additional duties on medical goods, see the guide to Section 301 tariffs on medical products.
Variants of the question
HTS search and USITC HTS
These are the same activity: the official schedule is maintained and published by the USITC, and its search is the primary place to read the line text and rate columns. Releases are numbered; the current release on 2026-11-01 was Revision 22 (2026).
HTS code lookup tools
Any lookup tool, official or not, is a way to find lines to read. CBP’s publication treats the HTSUS legal text and the GRIs as what governs. CBP also publishes its administrative classification rulings free of charge in its Customs Rulings Online Search System (CROSS); see the CBP CROSS guide.
How to determine an HTS code
CBP describes the GRIs as the single set of legal principles that always govern classification under the Harmonized System; there are six. The Explanatory Notes are neither legally binding nor dispositive, but they should be consulted for guidance and are considered persuasive authority.
How to find an HS code
Take the first six digits of the matching HTS line: those six digits are the international HS level. Countries add their own digits beyond six, usually at the 8-digit national level, so the full number differs by country.
Where it matters for labs and clinics
CBP states that classification matters beyond duty: it also determines whether goods are subject to quotas, restraints, embargoes or other restrictions. For supply and import work the number sits alongside other import rules and costs, for example the Harbor Maintenance Fee and the broader overview of importing medical devices into the US. For chemicals, see the HS code for chemicals term.
Who is responsible for what
| Step | What CBP says |
|---|---|
| Search tool | Finds candidate lines; the legal text and GRIs govern |
| Importer of record | Must use “reasonable care” to enter, classify and value goods |
| Binding ruling | Importers may request binding administrative rulings from CBP, or use an expert in customs law |
| CBP | Fixes the final classification and valuation, in a process called liquidation of the entry |
Common misunderstandings
- “The first search result is my code.” Results are listed in HTS-number order, not by relevance, and the syringe example spans three chapters.
- “All ten digits are law.” Only the first eight are legal text; the last two are statistical.
- “An HS code and an HTS code are identical.” They share the first six digits; the HTS adds national digits.
- “A chapter 99 line is a product category.” Chapter 99 reflects legislation and executive or administrative actions that temporarily amend or modify chapters 1 through 98; chapter 98 holds special classification provisions allowing duty-free or partial duty-free entry in special circumstances.
- “The search settles classification.” CBP’s publication warns that relying solely on its general information may not be considered reasonable care.
FAQ
What is an HTS lookup?
It is a search of the USITC’s Harmonized Tariff Schedule to find the line whose description matches a product, then reading its number, rates and units.
Is the 10-digit number the legal code?
No. The legal text ends at 8 digits; the 10-digit statistical-reporting number is for statistics (CBP, informed compliance publication on tariff classification).
Which chapter is a syringe in?
In the Revision 22 data checked on 2026-11-01, the keyword “syringe” returned lines in chapters 39, 90 and 99. Line 9018.31.00 in chapter 90 is described as “Syringes, with or without needles; parts and accessories thereof”; which line applies to a specific product is a classification decision, not a search result.
Sources
- U.S. International Trade Commission, Harmonized Tariff Schedule search and release list: https://hts.usitc.gov/. Checked 2026-11-01; release: 2026 HTS Revision 22.
- U.S. Customs and Border Protection, Tariff Classification, informed compliance publication (May 2004): https://www.cbp.gov/sites/default/files/documents/icp017r2_3.pdf. Checked 2026-11-01. The publication predates the current schedule; it is cited for its structural and responsibility statements.
