Mary Chao, D.O.
Internal Medicine Physician · Lansing, MI
Mary Chao, D.O. is an internal medicine physician with a practice address in Lansing, Michigan, and NPI 1881814002, issued on Apr 27, 2007. Check the license (Michigan 5101016242, as entered in NPPES) on the Michigan Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mary Chao
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 5101016242 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1540 Lake Lansing RD, Lansing, MI 48912
- Phone
- (517) 913-3810
- Enumerated
- Apr 27, 2007
- Entity
- Type 1 · individual
Also registered at 1540 Lake Lansing RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashraf Abdullah, MDInternal Medicine Physician1821006594
- Babar Ahmad, MDInternal Medicine Physician1619081684
- Anusuya Babu, MDInternal Medicine Physician1194734806
- Irene Baker, NPNurse Practitioner1033143417
- Karen Bowman, NPNurse Practitioner1417046566
- Cynthia Boynton, M.D.Internal Medicine Physician1013969930
Verify Mary Chao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine
Search for license 5101016242Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
5.1 times the Medicare Part D claims of the average internal medicine physician in 2024
14,102 Medicare Part D claims for 851 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 837 claims were for opioids.
Most prescribed
- Levothyroxine Sodium806 claims
- Atorvastatin Calcium517 claims
- Losartan Potassium478 claims
- Amlodipine Besylate429 claims
- Omeprazole392 claims
- Rosuvastatin Calcium370 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: $849.39
47 payments, mostly food and beverage; the largest payer was Pfizer Inc.. The 65,274 providers of this specialty with any payment received $2,536.66 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.
One hospital or facility affiliation
- Mclaren Greater LansingLansing, MI · Acute Care Hospitals3 of 5 stars
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
148 internal medicine physician records list a Lansing practice address
They are 148 of the 5,276 NPPES records with a Lansing practice address, and 6,589 internal medicine physician records in Michigan.
All 148 in Lansing → All 6,589 in Michigan → Every provider in Lansing →
Other internal medicine physician records in Michigan
- Keith Aaronson, MDAnn Arbor, MI1144305301
- Tomas Abalo, M.D.Iron Mountain, MI1336199975
- Ali Abbas, M.D.Pontiac, MI1972167526
- Hawazin Abbas, MDAuburn Hills, MI1699020677
- Imran Abbasi, D.O.Warren, MI1427409887
- Ramzi Abbasi, MDSaginaw, MI1164270005
- Saadat Abbasi, MDKalamazoo, MI1912005596
- Shahzaman Abbasi, MDLansing, MI1376512111
- Youssef Abbiss, D.O.Mount Clemens, MI1982991881
- Joseph Abbo, MDYpsilanti, MI1982136503
Common questions
What is Mary Chao, D.O.'s NPI number?
Mary Chao, D.O.'s National Provider Identifier (NPI) is 1881814002, issued on Apr 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mary Chao, D.O. located?
The NPPES record lists a practice address at 1540 Lake Lansing RD, Lansing, MI, 48912. Phone: (517) 913-3810. Providers update this record themselves, so call before visiting.
How can I verify Mary Chao, D.O.'s license?
NPPES lists Michigan license number 5101016242, as entered by the provider. Search the Michigan Board of Medicine at https://www.michigan.gov/lara/bureau-list/bpl/health/hp-lic-health-prof/medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Chao, D.O. prescribe under Medicare Part D?
In 2024, Mary Chao, D.O. had 14,102 Medicare Part D claims for 851 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.