OrganizationActive
M. Arthur Charles, M.D.
NPI 1316052012 · Research Study Specialist · Tustin, CA
M. Arthur Charles, M.D. is a Research Study Specialist organization in Tustin, CA (NPI 1316052012).
Provider details
- NPI number
- 1316052012
- Entity type
- Organization
- Primary specialty
- Research Study SpecialistOther Service Providers
- Organization subpart
- No
- Authorized official
- Christy Grefe, Billing Clerk(714) 894-6850
- License
- G22463 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
Detailed profile(91/100 index)
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
2492 Walnut Ave Ste 130
Tustin, CA 92780-6953
Phone: (714) 734-7944
Fax: (714) 734-7945
Street-level locationGet directions
Mailing address
2492 Walnut Ave Ste 130
Tustin, CA 92780-6953
Other names (DBA / former)
- Doing business as
- Diabetes Research Center Medical Clinic, Inc
Registry dates
- Enumerated
- 2006-08-20
- Last updated
- 2020-08-22
Frequently asked questions
- What is M. Arthur Charles, M.D.'s NPI number?
- M. Arthur Charles, M.D.'s National Provider Identifier (NPI) is 1316052012, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is M. Arthur Charles, M.D.?
- M. Arthur Charles, M.D. is classified in the NPPES registry as Research Study Specialist (Other Service Providers).
- Where is M. Arthur Charles, M.D. located?
- M. Arthur Charles, M.D.'s practice location on file with NPPES is 2492 Walnut Ave Ste 130, Tustin, CA 92780-6953.
- What is M. Arthur Charles, M.D.'s phone number?
- The practice phone number listed in the NPPES registry for M. Arthur Charles, M.D. is (714) 734-7944.
- Who is the authorized official for M. Arthur Charles, M.D.?
- The authorized official listed on M. Arthur Charles, M.D.'s NPPES record is Christy Grefe, Billing Clerk. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is M. Arthur Charles, M.D.'s NPI active?
- Yes — M. Arthur Charles, M.D.'s NPI (1316052012) is active in the NPPES registry as of the last update on 2020-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.