Harold E Quan M D Inc
NPI 1730290958 · Cardiovascular Disease Physician · Newhall, CA
Harold E Quan M D Inc is a Cardiovascular Disease Physician organization in Newhall, CA (NPI 1730290958).
Provider details
- NPI number
- 1730290958
- Entity type
- Organization
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Carol Quan, Office Manager(666) 255-8320
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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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
Registry dates
- Enumerated
- 2006-08-31
- Last updated
- 2009-02-06
Frequently asked questions
- What is Harold E Quan M D Inc's NPI number?
- Harold E Quan M D Inc's National Provider Identifier (NPI) is 1730290958, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Harold E Quan M D Inc?
- Harold E Quan M D Inc is classified in the NPPES registry as Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Harold E Quan M D Inc located?
- Harold E Quan M D Inc's practice location on file with NPPES is 23928 Lyons Ave, Newhall, CA 91321-2409.
- What is Harold E Quan M D Inc's phone number?
- The practice phone number listed in the NPPES registry for Harold E Quan M D Inc is (661) 255-8320.
- Who is the authorized official for Harold E Quan M D Inc?
- The authorized official listed on Harold E Quan M D Inc's NPPES record is Carol Quan, Office Manager. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Harold E Quan M D Inc's NPI active?
- Yes — Harold E Quan M D Inc's NPI (1730290958) is active in the NPPES registry as of the last update on 2009-02-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.