DR. RICHARD AUGUSTUS MESSIAN M.D.
NPI 1609929751
Internal Medicine - Gastroenterology in Concord, CA
NPI Status: Active since January 20, 2007
Contact Information
2415 HIGH SCHOOL AVE
SUITE 100
CONCORD, CA
ZIP 94520
Phone: (925) 687-9650
Fax: (925) 685-8447
- Individual
- Male
- Internal Medicine
- Gastroenterology
- PECOS Enrolled
About RICHARD MESSIAN
This page provides the complete NPI Profile along with additional information for Richard Messian, an internist established in Concord, California with a medical specialization in Internal Medicine, focusing in gastroenterology . The healthcare provider is registered in the NPI registry with number 1609929751 assigned on January 2007. The practitioner's primary taxonomy code is 207RG0100X with license number G268490 (CA). The provider is registered as an individual and his NPI record was last updated 17 years ago.
- NPI
- 1609929751
- Provider Name
- DR. RICHARD AUGUSTUS MESSIAN M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 2415 HIGH SCHOOL AVE SUITE 100 CONCORD, CA 94520
- Location Phone
- (925) 687-9650
- Location Fax
- (925) 685-8447
- Mailing Address
- 2415 HIGH SCHOOL AVE SUITE 100 CONCORD, CA 94520
- Mailing Phone
- (925) 687-9650
- Mailing Fax
- (925) 685-8447
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 01-20-2007
- Last Update Date
- 05-06-2008
- Code Navigator
An internist like Richard Messian is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
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
Internal Medicine Gastroenterology
- Taxonomy Code
- 207RG0100X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G268490
- License State
- CA
- Taxonomy Description
- An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Insurance Plans Accepted
According to publicly available information the provider might be accepting the following health plans from these health insurance companies:
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
*Please verify directly with this provider to make sure your insurance plan is currently accepted.
Additional Identifiers
The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.
| Identifier | Type / Code | Identifier State | Identifier Issuer |
|---|---|---|---|
| A43114 | MEDICARE UPIN (02) | CA | |
| 00G268490 | MEDICARE PIN (08) | CA | |
| 942184663 | OTHER (01) | CA | MY CORPORATION TAX ID # |
Medicare Participation & PECOS Enrollment Status
Richard Messian is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
Physician Visit Costs
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 94520 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $153.83
- Minimum New Patient Price $69
- Maximum New Patient Price $202.35
- Average New Patient Copayment $38.45
- Minimum New Patient Copayment $17.25
- Maximum New Patient Copayment $50.58
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $119.48
- Minimum Established Patient Price $23.44
- Maximum Established Patient Price $166.46
- Average Established Patient Copayment $29.87
- Minimum Established Patient Copayment $5.86
- Maximum Established Patient Copayment $41.61
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
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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 | 6 | 0 | 9 | 9 | 2 | 9 | 7 | 5 | 1 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 6 | 0 | 9 | 18 | 2 | 18 | 7 | 10 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 6 + 0 + 9 + 1 + 8 + 2 + 1 + 8 + 7 + 1 + 0 + 24 = 69 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 70 - 69 = 1 | 1 | ||||||||
The NPI number 1609929751 is valid because the calculated check digit 1 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following 12 providers are registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1376524231 | DR. LEIGH FULFORD KJELDSEN AUD Individual | Audiologist | 2415 HIGH SCHOOL AVE SUITE 300 CONCORD, CA 94520 (925) 676-8101 |
| 1912943093 | JULIE OATES FULFORD AUD Individual | Audiologist | 2415 HIGH SCHOOL AVE SUITE 300 CONCORD, CA 94520 (925) 676-8101 |
| 1417976606 | DR. SANDRA CUNNANE AU.D. Individual | Audiologist | 2415 HIGH SCHOOL AVE SUITE 300 CONCORD, CA 94520 (925) 676-8101 |
| 1003923236 | LORI KAY DANZE M.D. Individual | Internal Medicine | 2415 HIGH SCHOOL AVE SUITE #800 CONCORD, CA 94520 (925) 687-5210 |
| 1801904545 | SAM SUNDAR MD Individual | Internal Medicine | 2415 HIGH SCHOOL AVE SUITE 700 CONCORD, CA 94520 (925) 680-6846 |
| 1013094242 | JOANNA LYNN CHAN Individual | Audiologist | 2415 HIGH SCHOOL AVE #300 CONCORD, CA 94520 (925) 616-8101 |
| 1811040967 | GASTROENTEROLOGY MEDICAL GROUP, INC. Organization | Internal Medicine (Gastroenterology) | 2415 HIGH SCHOOL AVE SUITE 100 CONCORD, CA 94520 (925) 687-9650 |
| 1073823332 | DIABLO VALLEY PRIMARY CARE, INC. Organization | Internal Medicine | 2415 HIGH SCHOOL AVE SUITE 800 CONCORD, CA 94520 (925) 687-5210 |
| 1225336696 | MRS. MELANIE MARIE ANELLO N.P.-C Individual | Nurse Practitioner (Family) | 2415 HIGH SCHOOL AVE SUITE 300 CONCORD, CA 94520 (925) 685-8894 |
| 1326505280 | MINTRA SAEFONG PA-C Individual | Physician Assistant | 2415 HIGH SCHOOL AVE CONCORD, CA 94520 (925) 687-5210 |
| 1144374893 | CARDINAL PRIMARY CARE MEDICAL GROUP, INC Organization | Family Medicine | 2415 HIGH SCHOOL AVE SUITE 800 CONCORD, CA 94520 (925) 687-5210 |
| 1558392449 | DR. CHINNAVUTH PITOU DE MONTEIRO M.D. Individual | Internal Medicine | 2415 HIGH SCHOOL AVE SUITE 800 CONCORD, CA 94520 (925) 687-5210 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1609929751, enumerated in the NPI registry as an "individual" on January 20, 2007
The provider is located at 2415 High School Ave Suite 100 Concord, Ca 94520 and the phone number is (925) 687-9650
The provider's speciality is Internal Medicine with taxonomy code 207RG0100X with a focus in Gastroenterology
The provider might be accepting Accepts: Medicare and Medicaid. Please consult your insurance carrier or call the provider to make sure your health plan is currently accepted.
Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
Medicare beneficiaries should expect a typical cost of $153.83 with an average copayment of $38.45 for new patient appointments. Established patients should expect a typical charge of $119.48 and an average copayment of 29.87. Please review your insurance plan or contact the provider directly to determine your specific costs.
This NPI record was last updated on January 20, 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].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.