Christopher Timothy Isham, MD
Internal Medicine Physician · Ferndale, MI
Christopher Timothy Isham, MD is an internal medicine physician with a practice address in Ferndale, Michigan, and NPI 1265921753, issued on May 9, 2018. Check the license (Michigan 4301506885, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Christopher Timothy Isham
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301506885 MI
Self-reported in NPPES; status is on the state search - Practice location
- 221 W Troy St Ste 400, Ferndale, MI 48220
- Phone
- (248) 844-6100
- Enumerated
- May 9, 2018
- Record last updated
- Feb 15, 2024
- Fax
- (248) 844-6102
- Medicare enrollment
- Enrolled (PECOS I20220603002055); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 2017
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Verify Christopher Timothy Isham in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301506885Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,186 Medicare Part D claims for 123 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 27 claims were for opioids.
Most prescribed
- Amlodipine Besylate74 claims
- Atorvastatin Calcium74 claims
- Losartan Potassium52 claims
- Lisinopril49 claims
- Tamsulosin Hcl33 claims
- Farxiga27 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): 86.9 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).
Bills Medicare through one group practice
- Henry Ford Semi Medical GroupNovi, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher Timothy Isham among 5,735 internal medicine physician records in Michigan
Christopher Timothy Isham, MD 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 2018, is newer than 74% of them.
- NPI issued2018 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2017 · median 2006 among the 3,564 with a school on file
- Record last updated2024 · 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).
Internal Medicine Physician providers in Michigan
There are 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Ferndale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ted Naman, MDFerndale, MI 482201730156050
- Greg Naman, MDFerndale, MI 482201265493498
- Theresa Wills, FNP-BCFerndale, MI 482201962215533
- Murtaza Hussain, MDDetroit, MI 482211043238421
- Charanpreet Khangura, DODetroit, MI 482191821585001
- Shyam Khanna, M.D.Detroit, MI 482191487848735
- Felix Liddell, M.D.Detroit, MI 482191386737708
- Hester Pernell, M.D.Detroit, MI 482191124120423
Common questions
What is Christopher Timothy Isham, MD's NPI number?
Christopher Timothy Isham, MD's National Provider Identifier (NPI) is 1265921753, issued on May 9, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Timothy Isham, MD located?
The NPPES record lists a practice address at 221 W Troy St Ste 400, Ferndale, MI, 48220. Phone: (248) 844-6100. Providers update this record themselves, so call before visiting.
How can I verify Christopher Timothy Isham, MD's license?
NPPES lists Michigan license number 4301506885, 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 Christopher Timothy Isham, MD prescribe under Medicare Part D?
In 2024, Christopher Timothy Isham, MD had 1,186 Medicare Part D claims for 123 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Christopher Timothy Isham, MD's MIPS final score?
The 2023 MIPS final score is 86.9 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.