Crystal Rae Marsh-Koca, D.O.
Internal Medicine Physician · Warren, MI
Crystal Rae Marsh-Koca, D.O. is an internal medicine physician with a practice address in Warren, Michigan, and NPI 1528472123, issued on Jun 12, 2014. Check the license (Michigan 5101021322, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Crystal Rae Marsh-Koca
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 5101021322 MI
Self-reported in NPPES; status is on the state search - Practice location
- 11885 E 12 Mile RD Ste 300A, Warren, MI 48093
- Phone
- (586) 582-6630
- Enumerated
- Jun 12, 2014
- Record last updated
- Nov 18, 2025
- Fax
- (586) 582-6631
- Medicare enrollment
- Enrolled (PECOS I20200813000386); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2014
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 11885 E 12 Mile RD Ste 300A
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Crystal Rae Marsh-Koca in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 5101021322Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,076 Medicare Part D claims for 229 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Metoprolol Succinate193 claims
- Eliquis113 claims
- Atorvastatin Calcium103 claims
- Rosuvastatin Calcium87 claims
- Isosorbide Mononitrate Er63 claims
- Metoprolol Tartrate63 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $246.61
8 payments; by number, the most common kind was food and beverage; the largest payer was Zoll Services LLC (a/k/a Zoll LifeCor Corp). The 50,334 providers of this specialty with any payment received $1,303.06 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 3 group practices
- Academic Cardiology Associates, PCRochester Hills, MI
- Eastlake Cardiovascular PCSaint Clair Shores, MI
- Silver Pine Medical Group PLCSterling Heights, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Crystal Rae Marsh-Koca among 5,735 internal medicine physician records in Michigan
Crystal Rae Marsh-Koca, D.O. is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 64% of them.
- NPI issued2014 · 64% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2014 · median 2006 among the 3,564 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
90 internal medicine physician records list a practice address in Warren
They are 90 of the 2,799 NPPES records with a practice address in Warren, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Warren → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ying-Min Chen, M.D.Warren, MI 480931851340236
- Chaker Diab, DOWarren, MI 480931477522381
- Richard Gerber, MDWarren, MI 480931750367348
- Baruch Katz, M.D.Warren, MI 480931902803166
- Carolann Kinner, DOWarren, MI 480931306815089
- Deborah Levan, DOWarren, MI 480931700885407
- Richard Lubera, M.D.Warren, MI 480931457327744
- Salim Meram, MDWarren, MI 480931073503769
Common questions
What is Crystal Rae Marsh-Koca, D.O.'s NPI number?
Crystal Rae Marsh-Koca, D.O.'s National Provider Identifier (NPI) is 1528472123, issued on Jun 12, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Crystal Rae Marsh-Koca, D.O. located?
The NPPES record lists a practice address at 11885 E 12 Mile RD Ste 300A, Warren, MI, 48093. Phone: (586) 582-6630. Providers update this record themselves, so call before visiting.
How can I verify Crystal Rae Marsh-Koca, D.O.'s license?
NPPES lists Michigan license number 5101021322, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Crystal Rae Marsh-Koca, D.O. prescribe under Medicare Part D?
In 2024, Crystal Rae Marsh-Koca, D.O. had 1,076 Medicare Part D claims for 229 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Crystal Rae Marsh-Koca, D.O.'s MIPS final score?
The 2023 MIPS final score is 84.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.