Joseph Grizzanti, DO
Joseph Grizzanti, DO is an Allergy & Immunology (Internal Medicine) Physician in Hawthorne, NJ, registered under NPI 1932107554. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 297 LAFAYETTE AVE, Hawthorne, NJ 07506. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 33971 | NJ | Allergy & Immunology (Internal Medicine)… primary |
| 33971 | NJ | Allergy & Immunology Physician |
This provider holds licence 33971 issued in NJ. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Pulmonary Disease
- PAC ID
- 7416144662
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| New Jersey | I20110309000128 | Practitioner - Pulmonary Disease |
| New York | I20190219001848 | Practitioner - Pulmonary Disease |
Medicare enrolment is recorded as approved under the provider type Practitioner - Pulmonary Disease. There are 2 separate enrolment records across 2 states (NJ, NY). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Allergy & Immunology covers
An internist doctor of osteopathy that specializes in the treatment of allergy and immunologic disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Special Qualifications in the field of Allergy & Immunology. NUCC Health Care Provider Taxonomy, code 207RA0201X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RA0201X | Allergy & Immunology (Internal Medicine) Physician Allergy & Immunology | 33971 | NJ | primary |
| 207K00000X | Allergy & Immunology Physician | 33971 | NJ |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1932107554 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 8, 2005 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | DO |
| Practice address |
297 LAFAYETTE AVE Hawthorne, NJ 07506 (973) 790-4111 Fax (973) 790-4330 |
| Other identifiers |
1K3901
· Other BS091 · Other 08492890004 · Other 1207709 · Medicaid (NJ) 2189627 · Other |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 9 | 3 | 2 | 1 | 0 | 7 | 5 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 6 | 2 | 2 | 0 | 5 | 5 | 1 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.