Psychiatrist | 38+ years experience

Dr. Mary Lynn Nielsen, M.D.

225 S Meramec Ave, Suite 932t, Clayton, Missouri, 63105-3511

About Dr. Mary Lynn Nielsen

Dr. Mary Lynn Nielsen is a psychiatrist based in Clayton, Missouri with 38 years of experience in Psychiatry. She completed her graduation from University Of Illinois College Of Med (chi/peor/rock/chm-urb) in 1988. She accepts the Medicare-approved amount. Patients will not be billed for any more than the Medicare deductible and coinsurance. Active license number of Dr. Mary Lynn Nielsen is MDR7P10 for Psychiatry in Missouri. Her current practice location is 225 S Meramec Ave, Suite 932t, Clayton. Patients can contact her at 314-721-7550 or can fax her at 314-863-2114. Dr. Mary Lynn Nielsen, M.D., specializes in Psychiatry and her NPI number (Unique professional ID assigned by NPPES) is 1972645240.

Dr. Mary Lynn Nielsen specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Practice Information

Dr. Mary Lynn Nielsen's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Mary Lynn Nielsen
Specialization Psychiatry
Credentials M.D.
Accepts Medicare Assignment Yes
Experience 38+ years
Medical School Attended University Of Illinois College Of Med (chi/peor/rock/chm-urb)
Graduation Year 1988
Gender Female
Practice Address: 225 S Meramec Ave, Suite 932t
Clayton, MO - 63105-3511
Fax 314-863-2114

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

PAC ID 9234304072
Enrollment ID I20111207000043
NPI Number1972645240
NPI Enumeration Date: 13 Feb, 2007
NPI Last Update On: 08 Jul, 2007

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Mary Lynn Nielsen are as mentioned below.

License NumberSpecializationStateStatus
MDR7P10Psychiatry MissouriPrimary

Other Medical Identifiers

Other professional identifiers associated with Dr. Mary Lynn Nielsen such as Medicaid, Medicare PIN, NSC, UPIN etc. are mentioned as below.
IdentifierTypeStateIssuer
F31343MedicaidMissouri
11589908OtherCAQH
111963OtherMissouriBLUE CROSS

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Mary Lynn Nielsen
225 S Meramec Ave, Suite 932t
Clayton, MO - 63105-3511
Phone: 314-721-7550
Fax: 314-863-2114

Book an Appointment with Dr. Mary Lynn Nielsen

To schedule an appointment, contact Dr. Mary Lynn Nielsen at 225 S Meramec Ave, Suite 932t, Clayton, Missouri or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Mary Lynn Nielsen:

Dr. Mary Lynn Nielsen is a psychiatrist specializing in Psychiatry. She specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Dr. Mary Lynn Nielsen completed her education (M.D.) from University Of Illinois College Of Med (chi/peor/rock/chm-urb) in 1988.

Dr. Mary Lynn Nielsen has approximately 38 years of experience in Psychiatry.

Yes, Dr. Mary Lynn Nielsen accepts Medicare assignment, meaning the provider participates in Medicare and accepts Medicare-approved amounts for eligible services.

Yes, Dr. Mary Lynn Nielsen is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Mary Lynn Nielsen practices at 225 S Meramec Ave, Suite 932t, Clayton, Missouri, 63105-3511.

To schedule an appointment with Dr. Mary Lynn Nielsen, please contact the office at 314-721-7550.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.