2.1 CSA Scheduling, Registration & Ordering

Key Takeaways

  • DEA Schedules I through V classify controlled substances by abuse potential, accepted medical use and dependence liability under 21 U.S.C. § 812; Massachusetts adds a state Schedule VI for all other prescription-only drugs.
  • Retail pharmacies register with the DEA using Form 224 (renewed every 3 years via Form 224a), while manufacturers and distributors use Form 225 and Narcotic Treatment Programs use Form 363.
  • DEA registration numbers consist of 2 letters and 7 digits; the check digit is verified by adding the 1st, 3rd, and 5th digits to twice the sum of the 2nd, 4th, and 6th digits.
  • Schedule I and II drugs must be ordered using the single-sheet DEA Form 222 (or CSOS electronic PKI signatures), with completed executions valid for up to 60 days.
  • Under 21 CFR 1305.13, suppliers have up to 60 days from the execution date to fulfill partial shipments of DEA Form 222 orders.
Last updated: August 2026

2.1 CSA Scheduling, Registration & Ordering

MPJE Core Concept: The federal Controlled Substances Act (CSA), enacted as Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970 (21 U.S.C. § 801 et seq.), creates a "closed system of distribution" for legitimate handlers of controlled substances. Every individual and entity that manufactures, distributes, dispenses, imports, exports, or conducts research with controlled substances must be registered with the Drug Enforcement Administration (DEA) unless specifically exempt by federal law.


DEA Controlled Substance Schedules (Schedules I through V)

Under 21 U.S.C. § 812, controlled substances are categorized into five distinct schedules based on three criteria: potential for abuse, currently accepted medical use in treatment in the United States, and the degree of physical or psychological dependence the drug produces.

Schedule Breakdown & Statutory Criteria

ScheduleAbuse PotentialAccepted Medical UseDependence ProfileRepresentative Examples
Schedule I (C-I)HighNone in the U.S.Severe physical and psychological dependenceHeroin, Lysergic acid diethylamide (LSD), Marijuana/Cannabis (under federal law), Mescaline, Peyote, MDMA (Ecstasy), Methaqualone, 3,4-Methylenedioxypyrovalerone (MDPV)
Schedule II (C-II)HighAccepted (or with severe restrictions)Severe physical or severe psychological dependenceMorphine, Oxycodone (OxyContin, Percocet), Hydrocodone (Vicodin, Norco), Fentanyl, Methadone, Hydromorphone (Dilaudid), Amphetamine (Adderall), Methylphenidate (Ritalin), Secobarbital, Pentobarbital, Cocaine
Schedule III (C-III)Moderate (less than C-I/C-II)AcceptedLow-to-moderate physical or high psychological dependenceBuprenorphine (Suboxone, Subutex), Dronabinol (Marinol), Ketamine, Anabolic Steroids (Testosterone, Oxandrolone), Acetaminophen with Codeine (up to 90 mg codeine per dosage unit, e.g., Tylenol #3), Fiorinal (butalbital/aspirin/caffeine)
Schedule IV (C-IV)Low (less than C-III)AcceptedLimited physical or psychological dependence relative to C-IIIAlprazolam (Xanax), Diazepam (Valium), Lorazepam (Ativan), Clonazepam (Klonopin), Zolpidem (Ambien), Tramadol (Ultram), Carisoprodol (Soma), Phenobarbital, Modafinil (Provigil)
Schedule V (C-V)LowestAcceptedLimited physical or psychological dependence relative to C-IVCough preparations containing limited narcotics (≤200 mg codeine per 100 mL or 100 g, e.g., Robitussin AC, Phenergan with Codeine), Diphenoxylate with Atropine (Lomotil), Pregabalin (Lyrica), Lacosamide (Vimpat)

[!WARNING] Massachusetts adds a sixth schedule. Under M.G.L. c. 94C the Commonwealth maintains Schedule VI, comprising every drug that may be dispensed only on a prescription but is not in federal Schedules I through V. A drug that is unscheduled federally is therefore a state controlled substance in Massachusetts, with consequences for registration, electronic prescribing, technician scope and recordkeeping. Where state and federal scheduling differ for a particular product, apply the stricter classification, and verify the current Massachusetts placement in M.G.L. c. 94C and 105 CMR 700.000 rather than assuming it tracks the federal schedule. Section 5.4 develops this in full.


DEA Registration Requirements & Application Forms

To maintain the closed distribution system, every registrant operates under specific DEA registration classifications governed by 21 CFR Part 1301. Registration is granted to specific entities at specific physical locations.

Registration Categories & Forms Summary

  • DEA Form 224 (Initial) / Form 224a (Renewal):
    • Scope: Retail Community Pharmacies, Hospital/Clinic Pharmacies, Central Fill Pharmacies, Individual Practitioners (MD, DO, DDS, DVM, DPM), Teaching Institutions, and Mid-Level Practitioners (NPs, PAs, Optometrists).
    • Renewal Frequency: Every 3 years. Renewals are completed online using DEA Form 224a no more than 60 days prior to the expiration date.
  • DEA Form 225 (Initial) / Form 225a (Renewal):
    • Scope: Manufacturers, Wholesale Distributors, Reverse Distributors, Researchers, Analytical Laboratories, Importers, and Exporters.
    • Renewal Frequency: Annually (every 1 year).
  • DEA Form 363 (Initial) / Form 363a (Renewal):
    • Scope: Narcotic Treatment Programs (NTPs) / Opioid Treatment Programs (OTPs) dispensing methadone or buprenorphine for maintenance or detoxification.
    • Renewal Frequency: Annually (every 1 year).

Separate Location Principle

Under 21 CFR 1301.12, a separate DEA registration is required for each principal place of business where controlled substances are manufactured, distributed, stored, or dispensed. If a community pharmacy chain operates 5 retail locations, each individual store must hold its own distinct DEA registration. However, warehouse locations used solely for storage (without distribution to outside entities) do not require separate registration.


DEA Registration Number Structure & Validation Formula

A standard DEA registration number consists of 9 alphanumeric characters (2 letters followed by 7 digits).

Letter Structure

  1. First Letter (Registrant Type Identifier):
    • A, B, F, G: Individual Practitioners (Physicians, Dentists, Podiatrists, Veterinarians), Hospitals, Clinics, Retail Pharmacies.
    • M: Mid-Level Practitioners (Nurse Practitioners, Physician Assistants, Optometrists, Certified Nurse-Midwives).
    • P, R: Wholesale Distributors, Manufacturers, Reverse Distributors, Researchers, Importers, Exporters.
  2. Second Letter: Usually the first letter of the registrant's last name (for individual practitioners) or the first letter of the business name (for pharmacies or corporate entities). If the business name begins with a number, the second letter may be a digit.

7-Digit Verification Mathematical Formula

To verify whether a DEA number is mathematically authentic on the MPJE, apply the following 4-step calculation:

Step 1: Add the 1st, 3rd, and 5th digits=Sum1\text{Step 1: Add the 1st, 3rd, and 5th digits} = \text{Sum}_1

Step 2: Add the 2nd, 4th, and 6th digits, then multiply by 2=Sum2=2×(Digit2+Digit4+Digit6)\text{Step 2: Add the 2nd, 4th, and 6th digits, then multiply by 2} = \text{Sum}_2 = 2 \times (\text{Digit}_2 + \text{Digit}_4 + \text{Digit}_6)

Step 3: Add Sum1+Sum2=Grand Total\text{Step 3: Add } \text{Sum}_1 + \text{Sum}_2 = \text{Grand Total}

Step 4: Check if the last (rightmost) digit of the Grand Total matches the 7th digit (Check Digit)\text{Step 4: Check if the last (rightmost) digit of the Grand Total matches the 7th digit (Check Digit)}

Step-by-Step Example Walkthrough

  • DEA Number: BS7429168
  • Registrant: Dr. Jane Smith (B = Practitioner, S = Smith)
  • Step 1: $7 + 2 + 1 = 10$
  • Step 2: $4 + 9 + 6 = 19 \implies 19 \times 2 = 38$
  • Step 3: $10 + 38 = 48$
  • Step 4: The last digit of 48 is 8. The 7th digit of the DEA number is 8. The DEA number is mathematically valid.

Ordering Schedule I and II Controlled Substances: DEA Form 222 & CSOS

The transfer or purchase of Schedule I and II controlled substances requires an official ordering document under 21 CFR Part 1305.

Transition from Triplicate Form to Single-Sheet Form

Historically, DEA Form 222 was a 3-copy carbon paper document (Copy 1 Brown retained by supplier, Copy 2 Green sent to DEA, Copy 3 Blue retained by purchaser). Effective October 1, 2019, the DEA implemented the single-sheet DEA Form 222, and traditional triplicate forms became invalid after October 30, 2021.

  • Single-Sheet Specifications:
    • Contains 20 order lines per page (compared to 10 lines on the obsolete triplicate form).
    • The purchaser completes the single-sheet original, makes a copy (paper or electronic scan) for their own records, and sends the original single sheet to the supplier.
    • The supplier records the quantity shipped and date shipped on the original form and retains the original for 2 years.
    • The supplier is required to report order fulfillment details to the DEA via the ARCOS (Automation of Reports and Consolidated Orders System) database or by submitting a copy/electronic reporting to the DEA by the end of the month.

Execution Rules & 60-Day Validity Window

  • Signing Authority: DEA Form 222 must be signed and dated by the registrant or an individual granted formal Power of Attorney (POA) under 21 CFR 1305.05. POA authorizations must be kept on file with executed 222 forms but are not submitted to the DEA.
  • 60-Day Execution Limit: A DEA Form 222 is valid for 60 days from the date it was executed (signed) by the purchaser. If a supplier cannot fulfill the complete order immediately, partial shipments are permitted provided the remaining balance is shipped within 60 days of the execution date. After 60 days, the form expires and unfilled items are canceled.
  • Unexecuted / Defective Forms: If an order form is unacceptable to the supplier (e.g., incomplete, erased, altered, or unreadable), the supplier must return the original single-sheet Form 222 to the purchaser with a statement explaining the refusal. The purchaser must attach the statement and returned original form to their retained copy; unexecuted forms cannot be reused.

Controlled Substance Ordering System (CSOS)

  • Overview: CSOS allows digital ordering of Schedules I through V without paper forms.
  • Technology: Uses Public Key Infrastructure (PKI) digital certificates issued by the DEA CSOS Certification Authority.
  • Advantages: No line-item limit (paper Form 222 is capped at 20 items per form), faster delivery, lower transaction costs, and automated inventory reconciliation.
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DEA Form 222 Single-Sheet & CSOS Ordering & Fulfillment Workflow
Test Your Knowledge

A retail pharmacy seeking initial registration to dispense controlled substances must submit which DEA application form, and how frequently must this registration be renewed?

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B
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D
Test Your Knowledge

A pharmacist receives a prescription written by Dr. Jane Smith with DEA number BS7429168. Using the standard DEA number validation formula, is this DEA number valid based on its check digit?

A
B
C
D
Test Your Knowledge

A pharmacy orders 10 bottles of OxyContin 20 mg using a single-sheet DEA Form 222 dated May 1. The supplier partial-fills the order by shipping 6 bottles on May 5. Under federal law, what is the maximum length of time the supplier has from the execution date to ship the remaining 4 bottles before the order expires?

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B
C
D