Karen Sun, M.D.
NPI 1326229220 · Internal Medicine Physician · Irvine, CA
Karen Sun, M.D. is a Internal Medicine Physician provider in Irvine, CA (NPI 1326229220).
Provider details
- NPI number
- 1326229220
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A41436 (CA)
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
18 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 · 3 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Levothyroxine Sodium | 26 |
| Liothyronine Sodium | 19 |
| Progesterone, Micronizedbrand: Progesterone | 15 |
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
Registry dates
- Enumerated
- 2007-11-19
- Last updated
- 2007-11-19
Frequently asked questions
- What is Karen Sun's NPI number?
- Karen Sun's National Provider Identifier (NPI) is 1326229220, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Sun's specialty?
- Karen Sun is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Sun located?
- Karen Sun's practice location on file with NPPES is 4 Hughes Ste 150, Irvine, CA 92618-2044.
- What is Karen Sun's phone number?
- The practice phone number listed in the NPPES registry for Karen Sun is (949) 768-6780.
- Is Karen Sun's NPI active?
- Yes — Karen Sun's NPI (1326229220) is active in the NPPES registry as of the last update on 2007-11-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.