Januario Natanauan, M.D.
NPI 1437347879 · Family Medicine Physician · Rockford, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Januario Natanauan, M.D. is a Family Medicine Physician provider in Rockford, IL (NPI 1437347879).
Provider details
- NPI number
- 1437347879
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036122920 (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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
997 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 454 | $93 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 110 | $116 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 80 | $127 |
| Automated Urinalysis Test81003 | 79 | $2 |
| Respiratory Infectious Agent Detection By Rna for Severe Acute Respiratory Syndrome Coronavirus 2 (covid 19), Influenza A, Influenza B, and Respiratory Syncytial Virus, Upper Respiratory Specimen, Each Reported As Detected Or Not Detected0241U | 61 | $134 |
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Hyclate | 98 | 93 |
| Prednisone | 71 | 68 |
| Cephalexin | 51 | 50 |
| Azithromycin | 46 | 44 |
| Fluticasone Propionate | 45 | 45 |
| Mupirocin | 43 | 43 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 36 | 36 |
| Ciprofloxacin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-10-10
- Last updated
- 2010-03-15
Frequently asked questions
- What is Januario Natanauan's NPI number?
- Januario Natanauan's National Provider Identifier (NPI) is 1437347879, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Januario Natanauan's specialty?
- Januario Natanauan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Januario Natanauan located?
- Januario Natanauan's practice location on file with NPPES is 1215 N Alpine Rd, Rockford, IL 61107-2201.
- What is Januario Natanauan's phone number?
- The practice phone number listed in the NPPES registry for Januario Natanauan is (815) 391-7800.
- Does Januario Natanauan accept Medicare?
- Januario Natanauan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Januario Natanauan's NPI active?
- Yes — Januario Natanauan's NPI (1437347879) is active in the NPPES registry as of the last update on 2010-03-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.