Linda Doolan, MS, RD, LD
Linda Doolan, MS, RD, LD is a provider specialising in Nutrition Education Nutritionist in Oskaloosa, IA, registered under NPI 1598819591. 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 103 N 3RD ST, Oskaloosa, IA 52577. 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 |
|---|---|---|
| 01624 | IA | Nutrition Education Nutritionist primary |
| 01624 | IA | Pediatric Nutrition Registered Dietitian |
| 01624 | IA | Renal Nutrition Registered Dietitian |
| 01624 | IA | Metabolic Nutrition Registered Dietitian |
This provider holds licence 01624 issued in IA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Nutrition, Education covers
Definition to come... NUCC Health Care Provider Taxonomy, code 133NN1002X
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 | |
|---|---|---|---|---|
| 133NN1002X | Nutrition Education Nutritionist Nutrition, Education | 01624 | IA | primary |
| 133VN1004X | Pediatric Nutrition Registered Dietitian Nutrition, Pediatric | 01624 | IA | |
| 133VN1005X | Renal Nutrition Registered Dietitian Nutrition, Renal | 01624 | IA | |
| 133VN1006X | Metabolic Nutrition Registered Dietitian Nutrition, Metabolic | 01624 | IA |
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 | 1598819591 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 23, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MS, RD, LD |
| Practice address |
103 N 3RD ST Oskaloosa, IA 52577 (641) 676-3438 Fax (641) 676-3439 |
| Mailing address |
2094 263RD ST Oskaloosa, IA 52577 |
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 | 9 | 8 | 8 | 1 | 9 | 5 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 9 | 8 | 7 | 1 | 9 | 5 | 9 |
Sum = 79 · next multiple of 10 = 80 · check digit = 1 · actual last digit = 1
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.