DR. ANN M MASS MD
NPI 1598769358
Internal Medicine in Aspen, CO
About Dr. Ann M Mass Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANN M MASS MD (NPI 1598769358) is an individual internal medicine provider in Aspen, Colorado, licensed in Colorado (CO21624) and active in the NPI registry since June 2005. She has opted out of Medicare through January 1, 2028 and remains eligible to order and refer and holds a CLIA Waiver certificate valid through January 1, 2027.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Opted out of Medicare
Dr. Ann M Mass Md has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from January 1, 2024 through January 1, 2028.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 06D1002257
Ann Mass, MD · Aspen, COPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 81611 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 6
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ASPEN, CO 81611
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Ann Mass's NPI number?
The NPI number for Ann Mass is 1598769358. It was assigned to this individual provider in the NPPES registry on June 9, 2005.
Where is Ann Mass located?
Ann Mass practices at 225 N Mill St Ste 116, Aspen, CO 81611. The listed phone number is (970) 544-1234.
What is Ann Mass's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Ann Mass enrolled in Medicare?
No. Ann Mass has opted out of Medicare through January 1, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.
Does Ann Mass hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 06D1002257) is associated with this NPI, valid through January 1, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Ann Mass was last updated on January 26, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Ann M Mass, MD · NPI 1598769358
Internal Medicine physician in Aspen, Colorado. Individual provider, active in the CMS NPPES registry since June 9, 2005.
## Identity
- **NPI:** 1598769358 (Entity type: Individual)
- **Enumerated:** June 9, 2005
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** CO21624 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 225 N MILL ST, STE 116, Aspen, CO 81611-1958
- **Phone:** (970) 544-1234 · **Fax:** (970) 544-1310
## Medicare
- **Medicare:** Opted out of Medicare (opt-out affidavit on file, in effect through January 1, 2028); services are provided under private contract
## Record status
- **NPPES last updated:** January 26, 2016
- **Other identifiers:** Medicare UPIN C04161 (CO); Medicaid 01216241 (CO); Medicare PIN C800270 (CO)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1598769358) · Data from the CMS NPPES public registry.