RYOICHI OYASU M.D.
NPI 1255453957
Pathology - Anatomic Pathology & Clinical Pathology in Evanston, IL
NPI Status: Active since April 04, 2007
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Pathology
- Anatomic Pathology & Clinical Pathology
About RYOICHI OYASU
This page provides the complete NPI Profile along with additional information for Ryoichi Oyasu, a provider established in Evanston, Illinois with a medical specialization in Pathology, focusing in anatomic pathology & clinical pathology . The healthcare provider is registered in the NPI registry with number 1255453957 assigned on April 2007. The practitioner's primary taxonomy code is 207ZP0102X. The provider is registered as an individual and his NPI record was last updated August 2025.
- NPI
- 1255453957
- Provider Name
- RYOICHI OYASU M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 355 RIDGE AVE EVANSTON, IL 60202
- Location Phone
- (847) 316-4000
- Mailing Address
- 355 RIDGE AVE EVANSTON, IL 60202
- Mailing Phone
- (847) 316-4000
- Is Sole Proprietor?
- No
- Enumeration Date
- 04-04-2007
- Last Update Date
- 08-31-2025
- Code Navigator
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Pathology Anatomic Pathology & Clinical Pathology
- Taxonomy Code
- 207ZP0102X
- Type
- Allopathic & Osteopathic Physicians
- License State
- IL
- Taxonomy Description
- A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 2 | 5 | 5 | 4 | 5 | 3 | 9 | 5 | 7 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 2 | 10 | 5 | 8 | 5 | 6 | 9 | 10 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 2 + 1 + 0 + 5 + 8 + 5 + 6 + 9 + 1 + 0 + 24 = 63 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 70 - 63 = 7 | 7 | ||||||||
The NPI number 1255453957 is valid because the calculated check digit 7 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following 20 providers are registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1780632463 | IHC-ST. FRANCIS EMERGENCY PHYSICIANS, LLC Organization | Emergency Medicine | 355 RIDGE AVE EVANSTON, IL 60202 (414) 290-6720 |
| 1932154937 | DR. CARLOS H ESCAMILLA M.D. Individual | Radiology (Diagnostic Radiology) | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-6101 |
| 1427061977 | NORTHSHORE ANESTHESIOLOGISTS Organization | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1225129216 | NARAHARISETTY RAO MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1881785079 | CURT THEO MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1992896179 | BRAD ALEXANDER MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1134210354 | BRANKA PAVLOVIC MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1376634493 | ZBIGNIEW POMYKALA MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1881785095 | MAUREEN COLEMAN MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1538250733 | HOWARD SCHECHTER MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1760577860 | NAGESWARARAO LATCHAMSETTY MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1497817936 | AUSTIN ANESTHESIA LLC Organization | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-4000 |
| 1174685093 | RAFIQUE RAJWANI MD Individual | Anesthesiology | 355 RIDGE AVE EVANSTON, IL 60202 (800) 444-6110 |
| 1801938071 | MS. MARSHA A SMITH LCSW Individual | Social Worker (Clinical) | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-2024 |
| 1992825715 | NADIM Z YOUSSEF M.D. Individual | Pathology (Anatomic Pathology & Clinical Pathology) | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-4000 |
| 1952422115 | MARGARET YUNGBLUTH M.D. Individual | Pathology (Anatomic Pathology & Clinical Pathology) | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-4000 |
| 1194939876 | LOWELL Z WAX CRNA Individual | Nurse Anesthetist, Certified Registered | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-3364 |
| 1750574224 | DR. VENKATESH SARAVANAN MD,MRCP(UK) Individual | Internal Medicine | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-4000 |
| 1295929628 | DR. HARSHA RUDRAPPA MD Individual | Internal Medicine | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-4000 |
| 1083808794 | YOUMNA AHMED M.D Individual | Internal Medicine | 355 RIDGE AVE EVANSTON, IL 60202 (847) 316-4000 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1255453957, enumerated in the NPI registry as an "individual" on April 04, 2007
The provider is located at 355 Ridge Ave Evanston, Il 60202 and the phone number is (847) 316-4000
The provider's speciality is Pathology with taxonomy code 207ZP0102X with a focus in Anatomic Pathology & Clinical Pathology
This NPI record was last updated on April 04, 2007. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
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