Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Karen Spenser Kiefer, DO

Individual provider Psychiatry Physician · NPI 1578586574

Dr. Karen Spenser Kiefer, DO is a Psychiatry in Diamond Bar, California. Graduated from Midwestern University, Chicago College of Osteopathic Med in 1976, 50 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying
50
Trained at
Midwestern University, Chicago College of Osteopathic Med
Licensed in
CA
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

1715 Leaning Pine Dr
Diamond Bar, CA 91765-2738
Phone: (909) 261-4123
Fax: (909) 367-2922
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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 20A5060 (CA)

Record details

NPI number1578586574
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorYes
NPI enumeratedJuly 25, 2006
Last updated in NPPESAugust 11, 2020
Certification dateAugust 11, 2020

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolMIDWESTERN UNIVERSITY, CHICAGO COLLEGE OF OSTEOPATHIC MED
Graduated 1976 (50 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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