William Castaldo, M.D.
William Castaldo, M.D. is a Critical Care Medicine (Internal Medicine) Physician in Troy, OH, registered under NPI 1588669139. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 3006 N COUNTY ROAD 25A STE 102, Troy, OH 45373. 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 |
|---|---|---|
| 35064655 | OH | Critical Care Medicine (Internal… primary |
| 35064655 | OH | Pulmonary Disease Physician |
| 35064655 | OH | Sleep Medicine (Internal Medicine)… |
| 35064655 | OH | Hospitalist Physician |
This provider holds licence 35064655 issued in OH. 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 - Critical Care (intensivists)
- PAC ID
- 1153233317
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Virginia | I20180314000310 | Practitioner - Critical Care (intensivists) |
| Indiana | I20220729001161 | Practitioner - Critical Care (intensivists) |
Medicare enrolment is recorded as approved under the provider type Practitioner - Critical Care (intensivists). There are 2 separate enrolment records across 2 states (VA, IN). 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 Critical Care Medicine covers
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists. NUCC Health Care Provider Taxonomy, code 207RC0200X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | 35064655 | OH | primary |
| 207RP1001X | Pulmonary Disease Physician Pulmonary Disease | 35064655 | OH | |
| 207RS0012X | Sleep Medicine (Internal Medicine) Physician Sleep Medicine | 35064655 | OH | |
| 208M00000X | Hospitalist Physician | 35064655 | OH |
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 | 1588669139 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 20, 2005 |
| Last updated | Apr 12, 2013 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
3006 N COUNTY ROAD 25A STE 102 Troy, OH 45373 (937) 335-2075 Fax (937) 339-0612 |
| Mailing address |
PO BOX 1013 Troy, OH 45373 |
| Other identifiers |
0918181
· Medicaid (OH) |
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 | 5 | 8 | 8 | 6 | 6 | 9 | 1 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 7 | 8 | 3 | 6 | 9 | 1 | 6 |
Sum = 71 · next multiple of 10 = 80 · check digit = 9 · actual last digit = 9
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.