Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Weldon John Mallgren, DO

Individual provider Psychiatry Physician · NPI 1841384021

Weldon John Mallgren, DO practises Psychiatry in Claremore, Oklahoma. Graduated from Michigan College of Medicine and Surgery in 1993, 33 years ago. Practices with Grand Lake Mental Health Center, Inc, a 120-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Oklahoma.

Years since qualifying
33
Trained at
Michigan College of Medicine and Surgery
Licensed in
OK
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

17599 S Highway 88
Claremore, OK 74017-0801 Not confirmed with CMS for 15 years — call before visiting
Phone: (918) 342-9530
Fax: (918) 342-9533
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 2466 (OK)

Record details

NPI number1841384021
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedOctober 3, 2006
Last updated in NPPESMarch 1, 2011

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolMICHIGAN COLLEGE OF MEDICINE AND SURGERY
Graduated 1993 (33 years in practice)
Group practice Grand Lake Mental Health Center, Inc. — 120 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $84 3 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Grand Lake Mental Health Center, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 120 clinicians in the practice; 12 are shown here.