Christopher Greb, MD
NPI 1134623895 · Allergy & Immunology (Internal Medicine) Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Greb, MD is a Allergy & Immunology (Internal Medicine) Physician provider in Chicago, IL (NPI 1134623895).
Provider details
- NPI number
- 1134623895
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 125.075689 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
8 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 27 | 13 |
| Fluticasone Propionate | 27 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 12 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$848 across 9 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 2160 S 1st AveMaywood, IL 60153-3328Phone: (888) 584-7888
- 500 S Preston St Rm 305Louisville, KY 40202-1702Phone: (502) 852-8696
Registry dates
- Enumerated
- 2018-03-19
- Last updated
- 2023-06-26
- Certified
- 2023-06-26
Frequently asked questions
- What is Christopher Greb's NPI number?
- Christopher Greb's National Provider Identifier (NPI) is 1134623895, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Greb's specialty?
- Christopher Greb is listed in the NPPES registry with a primary specialty of Allergy & Immunology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Greb located?
- Christopher Greb's practice location on file with NPPES is 1725 W Harrison Street Ste 970, Chicago, IL 60612-3828.
- What is Christopher Greb's phone number?
- The practice phone number listed in the NPPES registry for Christopher Greb is (312) 942-6979.
- Does Christopher Greb accept Medicare?
- Christopher Greb is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Greb's NPI active?
- Yes — Christopher Greb's NPI (1134623895) is active in the NPPES registry as of the last update on 2023-06-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.