Katherine Ann Mass, MD
Obstetrics & Gynecology Physician · Virginia, MN
Katherine Ann Mass, MD is an obstetrics & gynecology physician with a practice address in Virginia, Minnesota, and NPI 1437787801, issued on Mar 31, 2020. Check the license (Minnesota 82368, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Katherine Ann Mass
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 82368 MN
Self-reported in NPPES; status is on the state search - Practice location
- 1101 9TH St N, Virginia, MN 55792
- Phone
- (218) 305-0000
- Enumerated
- Mar 31, 2020
- Record last updated
- Apr 23, 2026
- Medicare enrollment
- Enrolled (PECOS I20260220002067); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 878 in Minnesota → Look up another NPI →
Also registered at 1101 9TH St N
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jenna AltobelliFamily Nurse Practitioner1568027464
- Niles Batdorf, MDFamily Medicine Physician1780663559
- Wendy Baty, RN, CNPFamily Nurse Practitioner1609289446
- Leah Becicka, MDObstetrics & Gynecology Physician1396790390
- Neissa Boehm, RN, CNPAdult Health Nurse Practitioner1588897490
- Aaron Burkhart, MDOrthopaedic Surgery Physician1619518156
Verify Katherine Ann Mass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 82368Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
41% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
98 Medicare Part D claims for 50 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. 35 claims were for opioids.
Most prescribed
- Oxycodone Hcl27 claims
- Ibuprofen21 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Lutheran Hospital Association OF The San Luis ValleyAlamosa, CO
- The Duluth Clinic LtdVirginia, MN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Ann Mass among 878 obstetrics & gynecology physician records in Minnesota
Katherine Ann Mass, MD is one of 878 obstetrics & gynecology physician records with a practice address in Minnesota. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 92% of them.
- NPI issued2020 · 92% of these records are older, 6% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2020 · median 2007 among the 569 with a school on file
- Record last updated2026 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Minnesota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 obstetrics & gynecology physician records list a practice address in Virginia
They are 5 of the 465 NPPES records with a practice address in Virginia, and 878 obstetrics & gynecology physician records in Minnesota.
All 878 in Minnesota → Every provider in Virginia → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Leah Becicka, MDVirginia, MN 557921396790390
- Helen GettleVirginia, MN 557921710916572
- Carl PassalVirginia, MN 557921285650333
- Charles Tietz, MDVirginia, MN 557921861499584
- Stephen BloomDuluth, MN 558051245269695
- Jennifer Boyle, MDDuluth, MN 558051073582375
- Irene CarrDuluth, MN 558051437194735
- Susan Goltz, MDDuluth, MN 558051811966500
Common questions
What is Katherine Ann Mass, MD's NPI number?
Katherine Ann Mass, MD's National Provider Identifier (NPI) is 1437787801, issued on Mar 31, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Ann Mass, MD located?
The NPPES record lists a practice address at 1101 9TH St N, Virginia, MN, 55792. Phone: (218) 305-0000. Providers update this record themselves, so call before visiting.
How can I verify Katherine Ann Mass, MD's license?
NPPES lists Minnesota license number 82368, as entered by the provider. Search the Minnesota Board of Medical Practice at https://mn.gov/boards/medical-practice/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Ann Mass, MD prescribe under Medicare Part D?
In 2024, Katherine Ann Mass, MD had 98 Medicare Part D claims for 50 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.