Jennifer Greenfield, APN
NPI 1942842505 · Adult Health Nurse Practitioner · Chicago, IL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jennifer Greenfield, APN is a Adult Health Nurse Practitioner provider in Chicago, IL (NPI 1942842505).
Provider details
- NPI number
- 1942842505
- Entity type
- Individual
- Primary specialty
- Adult Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APN
- Sex
- Female
- Sole proprietor
- No
- License
- 309.019152041.424949 (IL)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
15 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 15 | $113 |
Typical Medicare-allowed amounts for these services range $113–$113 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Zanubrutinibbrand: Brukinsa | 321 | 36 |
| Acalabrutinib Maleatebrand: Calquence | 173 | 20 |
| Acyclovir | 152 | 45 |
| Venetoclaxbrand: Venclexta | 59 | 12 |
| Ibrutinibbrand: Imbruvica | 56 | — |
| Allopurinol | 42 | 15 |
| Folic Acid | 21 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,744 across 17 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
Registry dates
- Enumerated
- 2019-10-15
- Last updated
- 2023-08-31
- Certified
- 2023-04-17
Frequently asked questions
- What is Jennifer Greenfield's NPI number?
- Jennifer Greenfield's National Provider Identifier (NPI) is 1942842505, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jennifer Greenfield's specialty?
- Jennifer Greenfield is listed in the NPPES registry with a primary specialty of Adult Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Jennifer Greenfield located?
- Jennifer Greenfield's practice location on file with NPPES is 675 N Saint Clair St Fl 21, Chicago, IL 60611-5975.
- What is Jennifer Greenfield's phone number?
- The practice phone number listed in the NPPES registry for Jennifer Greenfield is (312) 695-0990.
- Does Jennifer Greenfield accept Medicare?
- Jennifer Greenfield is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jennifer Greenfield's NPI active?
- Yes — Jennifer Greenfield's NPI (1942842505) is active in the NPPES registry as of the last update on 2023-08-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.