Christopher Greb, MD
Allergy & Immunology (Internal Medicine) Physician · Chicago, IL
Christopher Greb, MD is an allergy & immunology (internal medicine) physician with a practice address in Chicago, Illinois, and NPI 1134623895, issued on Mar 19, 2018. Check the license (Illinois 036165118, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Christopher Greb
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology (Internal Medicine) Physician 207RA0201X
- License numbers
- 036165118 IL
125.075689 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1725 W Harrison Street Ste 970, Chicago, IL 60612
- Phone
- (312) 942-6979
- Enumerated
- Mar 19, 2018
- Record last updated
- Jun 26, 2023
- Medicare enrollment
- Enrolled (PECOS I20250905003609); accepts Medicare assignment
- Medical or professional school
- University Of Louisville School Of Medicine, 2020
- Entity
- Type 1 · individual
Verify Christopher Greb 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 036165118Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average allergy & immunology (internal medicine) physician in 2024
142 Medicare Part D claims for 32 beneficiaries, against an average of 789 among the 429 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of claims.
Most prescribed
- Azelastine Hcl27 claims
- Fluticasone Propionate27 claims
- Albuterol Sulfate Hfa12 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: $848.36
9 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 321 providers of this specialty with any payment received $7,456.30 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 one group practice
- Rush University Medical GroupChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Allergy & Immunology (Internal Medicine) Physician providers in Illinois
There are 22 allergy & immunology (internal medicine) physician records in Illinois.
Other allergy & immunology (internal medicine) physician records in Illinois
- Naveed Akhtar, M.D.Bolingbrook, IL1912997933
- Miguel Alcordo, M.D.Tinley Park, IL1477553899
- Sindhura Bandi, MDChicago, IL1891951208
- Mahera Husain, MDChicago, IL1659075596
- Julie Klemens, M.D.Lombard, IL1588708770
- Jason Knuffman, MDQuincy, IL1184690109
- Elizabeth Kudlaty, MDChicago, IL1326543232
- Sylvia Li, MDChicago, IL1508492463
- Amee Majmundar, M.D.Orland Park, IL1093794620
- Anna MoshkovichChicago, IL1568045953
Common questions
What is Christopher Greb, MD's NPI number?
Christopher Greb, MD's National Provider Identifier (NPI) is 1134623895, issued on Mar 19, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Greb, MD located?
The NPPES record lists a practice address at 1725 W Harrison Street Ste 970, Chicago, IL, 60612. Phone: (312) 942-6979. Providers update this record themselves, so call before visiting.
How can I verify Christopher Greb, MD's license?
NPPES lists Illinois license number 036165118, 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.
How much does Christopher Greb, MD prescribe under Medicare Part D?
In 2024, Christopher Greb, MD had 142 Medicare Part D claims for 32 beneficiaries; the average among allergy & immunology (internal medicine) physician prescribers was 789. 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.