Douglas Siegmund, FNP-C
NPI 1437837879 · Family Nurse Practitioner · Santa Ana, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Douglas Siegmund, FNP-C is a Family Nurse Practitioner provider in Santa Ana, CA (NPI 1437837879).
Provider details
- NPI number
- 1437837879
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C
- Sex
- Male
- Sole proprietor
- No
- License
- 95128967 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
2 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methylprednisolone | 56 | 55 |
| Mupirocin | 29 | 28 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 26 | 26 |
| Azithromycin | 25 | 24 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 25 | 25 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 23 | 23 |
| Albuterol Sulfate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$163 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 660 Baker St Ste A102Costa Mesa, CA 92626-4407Phone: (714) 668-2505Fax: (714) 668-2515
- 4950 Barranca Pkwy Ste 104Irvine, CA 92604-8644Phone: (949) 857-1248Fax: (949) 559-1165
Registry dates
- Enumerated
- 2023-07-06
- Last updated
- 2025-05-07
- Certified
- 2025-05-07
Frequently asked questions
- What is Douglas Siegmund's NPI number?
- Douglas Siegmund's National Provider Identifier (NPI) is 1437837879, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Douglas Siegmund's specialty?
- Douglas Siegmund is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Douglas Siegmund located?
- Douglas Siegmund's practice location on file with NPPES is 2010 E 1st St Ste 100, Santa Ana, CA 92705-4086.
- What is Douglas Siegmund's phone number?
- The practice phone number listed in the NPPES registry for Douglas Siegmund is (714) 556-7246.
- Does Douglas Siegmund accept Medicare?
- Douglas Siegmund is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Douglas Siegmund's NPI active?
- Yes — Douglas Siegmund's NPI (1437837879) is active in the NPPES registry as of the last update on 2025-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.