Colorado Code § 12-20-407

Unauthorized practice of profession or occupation - penalties - exclusions
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(1) (a) A person commits a class 2 misdemeanor and shall be punished as provided
in section 18-1.3-501 if the person:
(I) Violates section 12-100-112 or 12-100-116 (1)(a);
(II) Engages in or offers or attempts to engage in the conduct, promotion, or
performance of live boxing matches without an active license or permit issued under article 110
of this title 12;
(III) Engages or offers or attempts to engage in activities as an outfitter without an active
registration issued under article 145 of this title 12;
(IV) [Editor's note: This version of subsection (1)(a)(IV) is effective until July 1,
2025.] Engages in or works at or offers or attempts to engage in or work at the business, trade, or
calling of a residential, journeyman, master, or apprentice plumber; a water conditioning
contractor; a water conditioning installer; or a water conditioning principal without an active
license, permit, or registration issued under article 155 of this title 12; or
(IV) [Editor's note: This version of subsection (1)(a)(IV) is effective July 1, 2025.]
Engages in or works at or offers or attempts to engage in or work at the business, trade, or
calling of a residential, journeyworker, master, or apprentice plumber; a water conditioning
contractor; a water conditioning installer; or a water conditioning principal without an active
license, permit, or registration issued under article 155 of this title 12; or
(V) Practices or offers or attempts to practice any of the following professions or
occupations without an active license, certification, or registration issued under the part or article
of this title 12 governing the particular profession or occupation:
(A) Barbering, hairstyling, esthetics, manicuring, or cosmetology, as regulated under
article 105 of this title 12;
(B) The profession of an electrician, as regulated under article 115 of this title 12;
(C) Professional engineering, as regulated under article 120 of this title 12;
(D) Professional land surveying, as regulated under article 120 of this title 12;
(E) Architecture, as regulated under article 120 of this title 12;
(F) Landscape architecture, as regulated under article 130 of this title 12;
(G) Acupuncture, as regulated under article 200 of this title 12;
(H) Audiology, as regulated under article 210 of this title 12;
(I) Chiropractic, as regulated under article 215 of this title 12;
(J) Dentistry, dental therapy, or dental hygiene, as regulated under article 220 of this title
12;
(K) Direct-entry midwifery, as regulated under article 225 of this title 12;
(L) Practice as a hearing aid provider or engages in the practice of dispensing, fitting, or
dealing in hearing aids, as regulated under article 230 of this title 12;
(M) Medicine, practice as a physician assistant, or practice as an anesthesiologist
assistant, as regulated under article 240 of this title 12;
(N) Practice as a psychologist, social worker, marriage and family therapist, licensed
professional counselor, unlicensed psychotherapist, or addiction counselor, as regulated under
article 245 of this title 12;
(O) Practical or professional nursing or practice as a certified midwife, as regulated
under article 255 of this title 12;
(P) Nursing home administration, as regulated under article 265 of this title 12;
(Q) Optometry, as regulated under article 275 of this title 12;
(R) Pharmacy or as a pharmacy technician, as regulated under article 280 of this title 12;
(S) Physical therapy, as regulated under part 1 of article 285 of this title 12;
(T) Podiatry, as regulated under article 290 of this title 12;
(U) Practice as a psychiatric technician, as regulated under article 295 of this title 12;
(V) Respiratory therapy, as regulated under article 300 of this title 12;
(W) [Editor's note: This version of subsection (1)(a)(V)(W) is effective until January
1, 2026.] Veterinary medicine or as a veterinary technician, as regulated under article 315 of this
title 12; or
(W) [Editor's note: This version of subsection (1)(a)(V)(W) is effective January 1,
2026.] Veterinary medicine or as a veterinary technician or veterinary professional associate, as
regulated under article 315 of this title 12; or 
(X) Facilitating natural medicine services, as regulated under article 170 of this title 12.
(b) A person commits a class 2 misdemeanor and shall be punished as provided in
section 18-1.3-501 if the person engages in any of the following activities:
(I) Repealed.
(II) Practices or offers or attempts to practice athletic training without an active
registration issued under article 205 of this title 12;
(III) Practices or offers or attempts to practice massage therapy without an active license
issued under article 235 of this title 12 or knowingly aids or abets the unlicensed practice of
massage therapy;
(IV) Practices or offers or attempts to practice occupational therapy without an active
license as required by and issued under article 270 of this title 12 for occupational therapists or
occupational therapy assistants;
(V) Practices or offers or attempts to practice speech-language pathology without an
active certification issued under article 305 of this title 12;
(VI) Performs the duties of a surgical assistant or surgical technologist without being
registered under article 310 of this title 12; or
(VII) Conducts radon measurement or radon mitigation, claims to be a radon
measurement professional or radon mitigation professional, or uses the title "radon measurement
professional" or "radon mitigation professional" or any other title suggesting that the individual
is qualified to perform radon measurement or radon mitigation without an active license issued
under article 165 of this title 12.
(c) A person who practices or offers or attempts to practice as a naturopathic doctor
without an active registration issued under article 250 of this title 12 commits a class 2
misdemeanor and shall be punished as provided in section 18-1.3-501.
(d) A person who violates section 12-285-202 or 12-285-203 without an active
certification issued under part 2 of article 285 of this title 12 to practice as a physical therapist
assistant commits a class 2 misdemeanor and shall be punished as provided in section 18-1.3-
501.
(e) A person commits a class 6 felony and shall be punished as provided in section 18-
1.3-401 if the person practices or offers or attempts to practice any of the following professions
or occupations and intentionally and fraudulently represents oneself as a licensed, certified, or
registered professional or practitioner of any of the following:
(I) Professional engineering, as regulated pursuant to article 120 of this title 12;
(II) Architecture, as regulated pursuant to article 120 of this title 12;
(III) Audiology, as regulated pursuant to article 210 of this title 12;
(IV) Dentistry, as regulated pursuant to article 220 of this title 12;
(V) Direct-entry midwifery, as regulated pursuant to article 225 of this title 12;
(VI) Medicine, practice as a physician assistant, or practice as an anesthesiologist
assistant, as regulated pursuant to article 240 of this title 12;
(VII) Professional nursing or practice as a certified midwife, as regulated pursuant to
article 255 of this title 12;
(VIII) Nursing home administration, as regulated pursuant to article 265 of this title 12;
(IX) Optometry, as regulated pursuant to article 275 of this title 12;
(X) Pharmacy or as a pharmacy technician, as regulated pursuant to article 280 of this
title 12; or
(XI) Respiratory therapy, as regulated pursuant to article 300 of this title 12.
(2) The penalties for:
(a) Engaging in unauthorized activities regarding mortuaries and crematories are
governed by section 12-135-108;
(b) Violating article 140 of this title 12 concerning nontransplant tissue banks are
governed by section 12-140-108;
(c) Engaging in unauthorized activities regarding passenger tramways are governed by
section 12-150-108 (4); and
(d) Engaging in unauthorized activities regarding nurse aide practice are governed by
section 12-255-215.

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