Janet Nielsen, M.D.
NPI 1679773980 · Family Medicine Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet Nielsen, M.D. is a Family Medicine Physician provider in Naperville, IL (NPI 1679773980).
Provider details
- NPI number
- 1679773980
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 036.127246 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
301 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 148 | $101 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 57 | $136 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 54 | $68 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 42 | $87 |
Typical Medicare-allowed amounts for these services range $68–$136 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azithromycin | 57 | 56 |
| Prednisone | 49 | 48 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 38 | 36 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 29 | 22 |
| Cephalexin | 23 | 23 |
| Doxycycline Hyclate | 23 | 23 |
| Methylprednisolone | 18 | 18 |
Practice location
Mailing address
Additional practice locations (1)
- 701 W North AveMelrose Park, IL 60160-1612Phone: (708) 681-3200
Registry dates
- Enumerated
- 2007-07-24
- Last updated
- 2025-09-02
- Certified
- 2025-09-02
Frequently asked questions
- What is Janet Nielsen's NPI number?
- Janet Nielsen's National Provider Identifier (NPI) is 1679773980, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet Nielsen's specialty?
- Janet Nielsen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Janet Nielsen located?
- Janet Nielsen's practice location on file with NPPES is 1160 E Ogden Ave Ste 106, Naperville, IL 60563-2693.
- What is Janet Nielsen's phone number?
- The practice phone number listed in the NPPES registry for Janet Nielsen is (331) 226-0315.
- Does Janet Nielsen accept Medicare?
- Janet Nielsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet Nielsen's NPI active?
- Yes — Janet Nielsen's NPI (1679773980) is active in the NPPES registry as of the last update on 2025-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.