Yee Chuan Ang, M.D.
NPI 1104138668 · Internal Medicine Physician · Billings, MT
Yee Chuan Ang, M.D. is a Internal Medicine Physician provider in Billings, MT (NPI 1104138668).
Provider details
- NPI number
- 1104138668
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 245012 (MA)
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
15 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) |
|---|---|
| Oxybutynin Chloridebrand: Oxybutynin Chloride Er | 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)
- 759 Chestnut StSpringfield, MA 01199-1001Phone: (413) 794-4373
- 759 Chestnut StSpringfield, MA 01199-1001Phone: (413) 794-4373
Registry dates
- Enumerated
- 2010-07-12
- Last updated
- 2019-04-23
Frequently asked questions
- What is Yee Chuan Ang's NPI number?
- Yee Chuan Ang's National Provider Identifier (NPI) is 1104138668, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yee Chuan Ang's specialty?
- Yee Chuan Ang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Yee Chuan Ang located?
- Yee Chuan Ang's practice location on file with NPPES is 801 N 29th St, Billings, MT 59101.
- What is Yee Chuan Ang's phone number?
- The practice phone number listed in the NPPES registry for Yee Chuan Ang is (406) 238-2500.
- Is Yee Chuan Ang's NPI active?
- Yes — Yee Chuan Ang's NPI (1104138668) is active in the NPPES registry as of the last update on 2019-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.