Christa Johnson Mars, M.D.
Surgery Physician · Barron, WI
Christa Johnson Mars, M.D. is a surgery physician with a practice address in Barron, Wisconsin, and NPI 1235139510, issued on Jul 28, 2005. Check the license (Wisconsin 41999 020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Christa Johnson Mars
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License numbers
- 41999 020 WI
14966R LA
Self-reported in NPPES; status is on the state search - Practice location
- 1222 E Woodland Ave, Barron, WI 54812
- Phone
- (715) 537-3166
- Enumerated
- Jul 28, 2005
- Record last updated
- Jan 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 726 in Wisconsin → Look up another NPI →
Also registered at 1222 E Woodland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marilyn Adlin-Barnard, M.D.Family Medicine Physician1598720633
- Joshua BaltsOrthopaedic Surgery Physician1104184092
- Joseph Bell, DOObstetrics & Gynecology Physician1851471767
- Dale Bergeson, PAPhysician Assistant1730288150
- Lindsay Berkseth, M.D.Family Medicine Physician1346575214
- Timothy Berkseth, MDSurgery Physician1346403508
Verify Christa Johnson Mars in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 41999 020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average surgery physician in 2024
12 Medicare Part D claims, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D.
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.
Christa Johnson Mars among 726 surgery physician records in Wisconsin
Christa Johnson Mars, M.D. is one of 726 surgery physician records with a practice address in Wisconsin. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 88% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2012 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 surgery physician records list a practice address in Barron
They are 3 of the 122 NPPES records with a practice address in Barron, and 726 surgery physician records in Wisconsin.
All 726 in Wisconsin → Every provider in Barron → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Timothy Berkseth, MDBarron, WI 548121346403508
- Lemuel Yerby, M.D.Barron, WI 548121194875278
- Charles BertelAshland, WI 548061184669517
- Matthew Bettendorf, M.D.Ashland, WI 548061932254729
- Todd Sandstrom, MDCumberland, WI 548291972583029
- Mark Thayer, MDGrantsburg, WI 548401568424778
- Vicentiu AndreiHayward, WI 548431053348243
- Modesto Ferrer, M.D.Hayward, WI 548431134164403
Common questions
What is Christa Johnson Mars, M.D.'s NPI number?
Christa Johnson Mars, M.D.'s National Provider Identifier (NPI) is 1235139510, issued on Jul 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Christa Johnson Mars, M.D. located?
The NPPES record lists a practice address at 1222 E Woodland Ave, Barron, WI, 54812. Phone: (715) 537-3166. Providers update this record themselves, so call before visiting.
How can I verify Christa Johnson Mars, M.D.'s license?
NPPES lists Wisconsin license number 41999 020, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christa Johnson Mars, M.D. prescribe under Medicare Part D?
In 2024, Christa Johnson Mars, M.D. had 12 Medicare Part D claims; the average among surgery physician prescribers was 147. 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.