Mark O'Brien, DC
NPI 1770180895 · Chiropractor · El Dorado Hills, CA
Mark O'Brien, DC is a Chiropractor provider in El Dorado Hills, CA (NPI 1770180895).
Provider details
- NPI number
- 1770180895
- Entity type
- Individual
- Primary specialty
- ChiropractorChiropractic Providers
- Credential
- DC
- Sex
- Male
- Sole proprietor
- Yes
- License
- 35782 (CA)
Specialties & taxonomies
Chiropractic Providers
Chiropractic Providers
Chiropractic Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 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
- 2020-10-01
- Last updated
- 2020-10-01
- Certified
- 2020-10-01
Frequently asked questions
- What is Mark O'Brien's NPI number?
- Mark O'Brien's National Provider Identifier (NPI) is 1770180895, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark O'Brien's specialty?
- Mark O'Brien is listed in the NPPES registry with a primary specialty of Chiropractor (Chiropractic Providers).
- Where is Mark O'Brien located?
- Mark O'Brien's practice location on file with NPPES is 350 Green Valley Rd, El Dorado Hills, CA 95762-3927.
- What is Mark O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Mark O'Brien is (570) 690-5629.
- Is Mark O'Brien's NPI active?
- Yes — Mark O'Brien's NPI (1770180895) is active in the NPPES registry as of the last update on 2020-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.