Kristen Lynn Zack, MD
Nephrology Physician · Billings, MT
Kristen Lynn Zack, MD is a nephrology physician with a practice address in Billings, Montana, and NPI 1376105692, issued on Jul 8, 2019. Check the license (Montana 162224, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Kristen Lynn Zack
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 162224 MT
Self-reported in NPPES; status is on the state search - Practice location
- 1045 N 30TH St, Billings, MT 59101
- Phone
- (406) 238-2500
- Enumerated
- Jul 8, 2019
- Record last updated
- Aug 28, 2025
- Medicare enrollment
- Enrolled (PECOS I20260109001838); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 1045 N 30TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Xiu Ying AuEndocrinology, Diabetes & Metabolism Physician1659923712
- Gabriel Blomquist, P.A.Medical Physician Assistant1659772176
- Christa Boggis-Delacruz, MDObstetrics & Gynecology Physician1215642665
- Reed Christensen, M.D.Endocrinology, Diabetes & Metabolism Physician1902882673
- Brenda FlahertyStudent in an Organized Health Care Education/Training Program1942657762
- Landon Horst, RDRegistered Dietitian1124795562
Verify Kristen Lynn Zack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 162224Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average nephrology physician in 2024
131 Medicare Part D claims for 35 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of claims.
Most prescribed
- Amlodipine Besylate18 claims
- Jardiance18 claims
- Eplerenone12 claims
- Veltassa12 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.
Industry payments in 2024: $351.62
7 payments; by number, the most common kind was food and beverage; the largest payer was Baxter Healthcare. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Billings ClinicCody, WY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nephrology Physician providers in Montana
There are 26 nephrology physician records in Montana.
Other nephrology physician records in Montana
- Gabor Bodonyi-Kovacs, MDKalispell, MT1821288051
- Scot Born, M.D.Kalispell, MT1831298348
- Shahid Chaudhary, M.D.Missoula, MT1902986987
- Anthony De Mory, M.D.Billings, MT1316944572
- Margaret Eddy, MDMissoula, MT1114973229
- Michael Ganz, M.D.Billings, MT1356399257
- Gerald Groggel, MDBozeman, MT1932157716
- Stephen Guggenheim, M.D.Bozeman, MT1801158506
- Tobin Hoppes, M.D.Kalispell, MT1013952118
- Jonathan Jakubowski, MDBillings, MT1205322286
Common questions
What is Kristen Lynn Zack, MD's NPI number?
Kristen Lynn Zack, MD's National Provider Identifier (NPI) is 1376105692, issued on Jul 8, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Kristen Lynn Zack, MD located?
The NPPES record lists a practice address at 1045 N 30TH St, Billings, MT, 59101. Phone: (406) 238-2500. Providers update this record themselves, so call before visiting.
How can I verify Kristen Lynn Zack, MD's license?
NPPES lists Montana license number 162224, as entered by the provider. Search the Montana Board of Medical Examiners at https://ebiz.mt.gov/POL/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kristen Lynn Zack, MD prescribe under Medicare Part D?
In 2024, Kristen Lynn Zack, MD had 131 Medicare Part D claims for 35 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.