Sandra Frellsen, M.D.
NPI 1538114426 · Hospice and Palliative Medicine (Internal Medicine) Physician · Austin, TX
Enrolled with Medicare as Practitioner - Hospice/Palliative Care · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sandra Frellsen, M.D. is a Hospice and Palliative Medicine (Internal Medicine) Physician provider in Austin, TX (NPI 1538114426).
Provider details
- NPI number
- 1538114426
- Entity type
- Individual
- Primary specialty
- Hospice and Palliative Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- P4758 (TX)
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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 77 | 27 |
| Haloperidol | 48 | 45 |
| Lorazepam | 48 | 43 |
| Mirtazapine | 46 | 20 |
| Metoprolol Tartrate | 40 | 13 |
| Gabapentin | 33 | 19 |
| Trazodone Hcl | 32 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-23
- Last updated
- 2023-01-19
- Certified
- 2023-01-19
Frequently asked questions
- What is Sandra Frellsen's NPI number?
- Sandra Frellsen's National Provider Identifier (NPI) is 1538114426, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sandra Frellsen's specialty?
- Sandra Frellsen is listed in the NPPES registry with a primary specialty of Hospice and Palliative Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Sandra Frellsen located?
- Sandra Frellsen's practice location on file with NPPES is 4107 Spicewood Springs Rd, Austin, TX 78759-8660.
- What is Sandra Frellsen's phone number?
- The practice phone number listed in the NPPES registry for Sandra Frellsen is (512) 397-3360.
- Does Sandra Frellsen accept Medicare?
- Sandra Frellsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sandra Frellsen's NPI active?
- Yes — Sandra Frellsen's NPI (1538114426) is active in the NPPES registry as of the last update on 2023-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.