Ruth Ann Crystal, MD, a Professional Corporation
NPI 1881640423 · Obstetrics & Gynecology Physician · Palo Alto, CA
Ruth Ann Crystal, MD, a Professional Corporation is a Obstetrics & Gynecology Physician organization in Palo Alto, CA (NPI 1881640423).
Provider details
- NPI number
- 1881640423
- Entity type
- Organization
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Ruth Crystal, President(650) 858-6800
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
20 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
- 2006-05-25
- Last updated
- 2007-12-03
Frequently asked questions
- What is Ruth Ann Crystal, MD, a Professional Corporation's NPI number?
- Ruth Ann Crystal, MD, a Professional Corporation's National Provider Identifier (NPI) is 1881640423, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Ruth Ann Crystal, MD, a Professional Corporation?
- Ruth Ann Crystal, MD, a Professional Corporation is classified in the NPPES registry as Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Ruth Ann Crystal, MD, a Professional Corporation located?
- Ruth Ann Crystal, MD, a Professional Corporation's practice location on file with NPPES is 3200 Middlefield Rd, Palo Alto, CA 94306-3046.
- What is Ruth Ann Crystal, MD, a Professional Corporation's phone number?
- The practice phone number listed in the NPPES registry for Ruth Ann Crystal, MD, a Professional Corporation is (650) 858-6800.
- Who is the authorized official for Ruth Ann Crystal, MD, a Professional Corporation?
- The authorized official listed on Ruth Ann Crystal, MD, a Professional Corporation's NPPES record is Ruth Crystal, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Ruth Ann Crystal, MD, a Professional Corporation's NPI active?
- Yes — Ruth Ann Crystal, MD, a Professional Corporation's NPI (1881640423) is active in the NPPES registry as of the last update on 2007-12-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.