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Missouri Referable Physicians

What is a referable physician?

Referable physicians are MD or DO members of the American Academy of Environmental Medicine who have successfully completed the Core Curriculum consisting of four Instructional Courses.

The designation of Fellow is awarded to members who have successfully completed the Core Curriculum and passed the board examination of American Board of Environmental Medicine.


A.L. Barrier, M.D., FAAO-HNS (Member)

University of Missouri
One Hospital Dr., Room MA314
Columbia, MO 65212
Tel: (573) 882-2104

Specialties: Otolaryngology, Head and Neck Surgery Otolaryngic Allergy

Certifications: American Otalarynogy Head and Neck Surgery, American Academy of Otalaryngic Allergy

Basic Diagnostic Techniques:

  • (I): IDT, RAST, Patch Testing

Tipu Sultan, M.D. (Fellow)

Environmental Health and Allergy Center
11585 West Florissant Ave.
Florissant, MO 63033
Tel: (314) 921-5600

Specialties: Adolescent Medicine, Allergy, Environmental Medicine, Family Practice, Immunologic Metabolic Disorders, Nutritional Medicine, Pediatrics, Preventive Medicine

Certifications: Environmental Medicine, Pediatrics

Basic Diagnostic Techniques:

  • Ecologic Oriented History, Serial Endpoint Titration, Sublingual P/N, Intradermal P/N
  • (D): Diet Elimination, Rotary Diversified Diet, Oral Challenge Diet

Basic Treatment Techniques:

  • (I): Inhalant Antigens: Based on Neutralization, Optimal Dose, Sublingual, Subcutaneous, Maximum Tolerated Dose
  • (F): Food Antigens: Based on Neutralization: Sublingual, Subcutaneous
  • (C): Chemical Antigens: Based on Neutralization: Sublingual, Subcutaneous
  • Avoidance
  • Rotary Diversified Diet

James W. Willoughby, II, D.O. (Member)

24 South Main St.
Liberty, MO 64068
Tel: (816) 781-0902

Specialties: Allergy, Chelation, Environmental Medicine, Immunologic Metabolic Disorders, Nutritional Medicine, Pediatrics

Basic Diagnostic Techniques:

  • Ecologic Oriented History, Serial Endpoint Titration, Sublingual P/N, Intradermal P/N
  • (D): Diet Elimination, Rotary Diversified Diet, Oral Challenge Diet
  • (I): RAST IGE, RAST IGG

Basic Treatment Techniques:

  • (I): Inhalant Antigens: Based on Neutralization, Optimal Dose, Sublingual, Subcutaneous
  • (F): Food Antigens: Based on Neutralization: Sublingual, Subcutaneous
  • (C): Chemical Antigens: Based on Neutralization: Sublingual, Subcutaneous
  • Avoidance
  • Rotary Diversified Diet

Carl E. Bosley, D.O., Ph.D. (Member)

2503 Lucy Lee Pkwy.
Poplar Bluff, MO 63901
Tel: (573) 785-5544

Specialties: Allergy, Otolaryngology

Certifications: Otolaryngology, American Osteopathic Board - Otorhinolaryngology


Charles L. Crist, M.D. (Member)

1824 S. Lone Pine Ave., Suite C
PO Box B
Springfield, MO 65804
Tel: (417) 886-8995

Specialties: Borreliosrs (Tick-borne infections); Chronic Diseases

Certifications: Family Practice


Simon M. Yu, M.D. (Member)

11710 Old Ballas Road Suite 205
St. Louis, MO 63141
Tel: (314) 432-7802

Specialties: Environmental Medicine, Internal Medicine, Nutritional Medicine

Certifications: Internal Medicine

Basic Diagnostic Techniques:

  • (I): See Webpage

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