Karen Quan, MD, MS
NPI 1023713450 · Psychiatry Physician · Orange, CA
Enrolled with Medicare as Order and Referring Only - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Quan, MD, MS is a Psychiatry Physician provider in Orange, CA (NPI 1023713450).
Provider details
- NPI number
- 1023713450
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MS
- Sex
- Female
- Sole proprietor
- No
- License
- A199635 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (2)
- 3800 W Chapman Ave Ste 500Orange, CA 92868-1638Phone: (714) 456-5770
- 800 N Main StSanta Ana, CA 92701-3576Phone: (714) 456-5770
Registry dates
- Enumerated
- 2023-04-04
- Last updated
- 2026-05-27
- Certified
- 2026-05-27
Frequently asked questions
- What is Karen Quan's NPI number?
- Karen Quan's National Provider Identifier (NPI) is 1023713450, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Quan's specialty?
- Karen Quan is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Quan located?
- Karen Quan's practice location on file with NPPES is 101 the City Dr S Bldg 3, Orange, CA 92868-3201.
- What is Karen Quan's phone number?
- The practice phone number listed in the NPPES registry for Karen Quan is (714) 456-5770.
- Does Karen Quan accept Medicare?
- Karen Quan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Quan's NPI active?
- Yes — Karen Quan's NPI (1023713450) is active in the NPPES registry as of the last update on 2026-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.