Douglas John Frohlich, D.O.
Geriatric Medicine (Family Medicine) Physician · Chicago, IL
Douglas John Frohlich, D.O. is a geriatric medicine (family medicine) physician with a practice address in Chicago, Illinois, and NPI 1699960690, issued on Sep 12, 2007. Check the license (Illinois 036-074096, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Douglas John Frohlich
- Credential
- D.O.
- Primary taxonomy
- Geriatric Medicine (Family Medicine) Physician 207QG0300X
- License numbers
- 036-074096 IL
036074096 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1229 N North Branch St, Chicago, IL 60622
- Phone
- (312) 939-5090
- Enumerated
- Sep 12, 2007
- Record last updated
- Nov 17, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 1229 N North Branch St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joseph Asbury, M.D.Geriatric Medicine (Internal Medicine) Physician1730114612
- Targol Esmaili, BS, DPMFoot & Ankle Surgery Podiatrist1689098766
- Norman Johnston, M.D.Geriatric Medicine (Family Medicine) Physician1003845413
- Mikhail Magdel, MDGeriatric Medicine (Internal Medicine) Physician1528258571
- Sarah Mendenhall, M.D.Geriatric Medicine (Internal Medicine) Physician1558301705
- Joseph Misulonas, MDGeriatric Medicine (Internal Medicine) Physician1104936392
Verify Douglas John Frohlich in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036-074096Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Geriatric Medicine (Family Medicine) Physician providers in Illinois
There are 52 geriatric medicine (family medicine) physician records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
Other geriatric medicine (family medicine) physician records in Illinois
- Olajumoke Adubifa, M.D.Kankakee, IL1598832875
- Farooq Ahmed, M.DSkokie, IL1275553240
- Azeem Ahsan, DOCrest Hill, IL1861543985
- Halley Anderson, DOQuincy, IL1427495803
- Alpheus Appenheimer, M.D.Dixon, IL1417937632
- Ryan Bartkus, M.D.Elk Grove Village, IL1124318837
- Magdalena Bednarczyk, MDChicago, IL1861703928
- Vasireddy Bhoopal, M.D.,Palos Heights, IL1154333961
- Zofia Cygan, M.D.Lisle, IL1275627614
- Jerome Donnelly, DOWestern Springs, IL1578616819
Common questions
What is Douglas John Frohlich, D.O.'s NPI number?
Douglas John Frohlich, D.O.'s National Provider Identifier (NPI) is 1699960690, issued on Sep 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Douglas John Frohlich, D.O. located?
The NPPES record lists a practice address at 1229 N North Branch St, Chicago, IL, 60622. Phone: (312) 939-5090. Providers update this record themselves, so call before visiting.
How can I verify Douglas John Frohlich, D.O.'s license?
NPPES lists Illinois license number 036-074096, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.