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

Hilary Castelnau Siebens, MD

Individual provider Physical Medicine & Rehabilitation Physician · NPI 1639334790

Hilary Castelnau Siebens, MD is a Physical Medicine & Rehabilitation Physician in Seal Beach, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2008
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

13601 Del Monte Dr 47A
Seal Beach, CA 90740-6722
Phone: (949) 735-6813
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physical Medicine & Rehabilitation Physician (primary) Taxonomy 208100000X · Licence G61003 (CA)

Record details

NPI number1639334790
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 28, 2008
Last updated in NPPESJuly 28, 2008

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