Natalie Cac
NPI 1205006657 · Allergy & Immunology Physician · Hayward, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Natalie Cac is a Allergy & Immunology Physician provider in Hayward, CA (NPI 1205006657).
Provider details
- NPI number
- 1205006657
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- 48106 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 36 | 18 |
| Ipratropium Bromide | 12 | — |
| Montelukast Sodium | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 39400 Paseo Padre PkwyFremont, CA 94538-2310Phone: (510) 248-3188
Registry dates
- Enumerated
- 2008-03-01
- Last updated
- 2024-11-08
- Certified
- 2024-11-08
Frequently asked questions
- What is Natalie Cac's NPI number?
- Natalie Cac's National Provider Identifier (NPI) is 1205006657, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Natalie Cac's specialty?
- Natalie Cac is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Natalie Cac located?
- Natalie Cac's practice location on file with NPPES is 27303 Sleepy Hollow Ave S, Hayward, CA 94545-4203.
- What is Natalie Cac's phone number?
- The practice phone number listed in the NPPES registry for Natalie Cac is (510) 784-6225.
- Does Natalie Cac accept Medicare?
- Natalie Cac is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Natalie Cac's NPI active?
- Yes — Natalie Cac's NPI (1205006657) is active in the NPPES registry as of the last update on 2024-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.