Ann Mass, MD
NPI 1598769358 · Internal Medicine Physician · Aspen, CO
Ann Mass, MD is a Internal Medicine Physician provider in Aspen, CO (NPI 1598769358).
Provider details
- NPI number
- 1598769358
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 21624 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
21 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- 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 · 65 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 218 | 64 |
| Rosuvastatin Calcium | 142 | 45 |
| Losartan Potassium | 105 | 28 |
| Levothyroxine Sodium | 104 | 36 |
| Zolpidem Tartrate | 74 | 33 |
| Ezetimibe | 73 | 22 |
| Escitalopram Oxalate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15 across 1 record (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
Registry dates
- Enumerated
- 2005-06-09
- Last updated
- 2016-01-26
Frequently asked questions
- What is Ann Mass's NPI number?
- Ann Mass's National Provider Identifier (NPI) is 1598769358, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ann Mass's specialty?
- Ann Mass is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ann Mass located?
- Ann Mass's practice location on file with NPPES is 225 N Mill St, Aspen, CO 81611-1958.
- What is Ann Mass's phone number?
- The practice phone number listed in the NPPES registry for Ann Mass is (970) 544-1234.
- Is Ann Mass's NPI active?
- Yes — Ann Mass's NPI (1598769358) is active in the NPPES registry as of the last update on 2016-01-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.