Arnold Loo, D.O.
NPI 1063716918 · Internal Medicine Physician · Rohnert Park, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Arnold Loo, D.O. is a Internal Medicine Physician provider in Rohnert Park, CA (NPI 1063716918).
Provider details
- NPI number
- 1063716918
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A4953 (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
15 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
- 2011-01-07
- Last updated
- 2011-01-07
Frequently asked questions
- What is Arnold Loo's NPI number?
- Arnold Loo's National Provider Identifier (NPI) is 1063716918, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Arnold Loo's specialty?
- Arnold Loo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Arnold Loo located?
- Arnold Loo's practice location on file with NPPES is 490 City Center Drive, Rohnert Park, CA 94928.
- What is Arnold Loo's phone number?
- The practice phone number listed in the NPPES registry for Arnold Loo is (707) 585-7780.
- Does Arnold Loo accept Medicare?
- Arnold Loo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Arnold Loo's NPI active?
- Yes — Arnold Loo's NPI (1063716918) is active in the NPPES registry as of the last update on 2011-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.