Karen Xiao, MD
NPI 1396232922 · Gastroenterology Physician · New Haven, CT
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Xiao, MD is a Gastroenterology Physician provider in New Haven, CT (NPI 1396232922).
Provider details
- NPI number
- 1396232922
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 78960 (CT)
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
8 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 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 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Linaclotidebrand: Linzess | 12 |
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 (2)
- 428 Columbus AveNew Haven, CT 06519-1233Phone: (203) 503-3000
- 8 Devine St Ste 1North Haven, CT 06473-2172Phone: (877) 925-3637
Registry dates
- Enumerated
- 2018-04-19
- Last updated
- 2024-07-19
- Certified
- 2024-07-19
Frequently asked questions
- What is Karen Xiao's NPI number?
- Karen Xiao's National Provider Identifier (NPI) is 1396232922, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Xiao's specialty?
- Karen Xiao is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Xiao located?
- Karen Xiao's practice location on file with NPPES is 20 York St, New Haven, CT 06510-3220.
- What is Karen Xiao's phone number?
- The practice phone number listed in the NPPES registry for Karen Xiao is (203) 688-4242.
- Does Karen Xiao accept Medicare?
- Karen Xiao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Xiao's NPI active?
- Yes — Karen Xiao's NPI (1396232922) is active in the NPPES registry as of the last update on 2024-07-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.