MARISSA ELIZABETH SHEARER MSN, APRN, ACNP-BC
NPI 1447194782
Nurse Practitioner - Acute Care in Saint Louis, MO
NPI Status: Active since April 16, 2026
Contact Information
1201 S GRAND BLVD
SAINT LOUIS, MO
ZIP 63104
Phone: (314) 607-8156
- Individual
- Female
- Nurse Practitioner
- Acute Care
- PECOS Enrolled
About MARISSA SHEARER
This page provides the complete NPI Profile along with additional information for Marissa Shearer, a provider established in Saint Louis, Missouri with a medical specialization in Nurse Practitioner, focusing in acute care . The healthcare provider is registered in the NPI registry with number 1447194782 assigned on April 2026. The practitioner's primary taxonomy code is 363LA2100X with license number 2026007462 (MO). The provider is registered as an individual and her NPI record was last updated April 2026.
- NPI
- 1447194782
- Provider Name
- MARISSA ELIZABETH SHEARER MSN, APRN, ACNP-BC
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 1201 S GRAND BLVD SAINT LOUIS, MO 63104
- Location Phone
- (314) 607-8156
- Mailing Address
- 10711 SAINT MATTHEW LN SAINT ANN, MO 63074
- Mailing Phone
- (314) 607-8156
- Is Sole Proprietor?
- No
- Enumeration Date
- 04-16-2026
- Last Update Date
- 04-17-2026
- Code Navigator
A nurse practitioner (NP) like Marissa Shearer is an experienced registered nurse with a master’s or doctoral degree and advanced clinical training. Nurse practitioners can work in many different specialties including primary care, pediatrics, cardiology, emergency, women’s health, oncology or geriatrics. Nurse practitioners provide services like physical exams, order laboratory tests, manage diseases, write prescriptions, etc.
Location Map
Secondary Locations
- 12303 De Paul Dr
Bridgeton, MO 63044
(314) 344-6000
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
Nurse Practitioner Acute Care
- Taxonomy Code
- 363LA2100X
- Type
- Physician Assistants & Advanced Practice Nursing Providers
- License No.
- 2026007462
- License State
- MO
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 207R00000X | Allopathic & Osteopathic Physicians | Internal Medicine | 2026007462 (MO) |
Medicare Participation & PECOS Enrollment Status
Marissa Shearer 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 63104 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99203
- Average New Patient Price $86.32
- Minimum New Patient Price $55.65
- Maximum New Patient Price $169.38
- Average New Patient Copayment $21.58
- Minimum New Patient Copayment $13.91
- Maximum New Patient Copayment $42.34
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $98.37
- Minimum Established Patient Price $17.76
- Maximum Established Patient Price $137.92
- Average Established Patient Copayment $24.59
- Minimum Established Patient Copayment $4.44
- Maximum Established Patient Copayment $34.48
* 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 NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1447194782, we treat the final digit (2) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 78. The final step is to find the difference between that total and the next multiple of ten (80 - 78 = 2).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 78 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
SAINT LOUIS, MO 63104
SAINT LOUIS, MO 63104
SAINT LOUIS, MO 63104
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1447194782, enumerated as an "individual" on April 16, 2026.
The provider is located at 1201 S GRAND BLVD SAINT LOUIS, MO 63104 and the phone number is (314) 607-8156.
Nurse Practitioner with taxonomy code 363LA2100X and a focus in Acute Care.
