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DR. MAISA A NAZZAL M.D.
NPI 1295991073
Internal Medicine - Nephrology in Saint Louis, MO

Active since August 01, 2008PECOS EnrolledAccepts Medicare Assignment
675 OLD BALLAS RD STE 104, SAINT LOUIS, MO 63141(314) 993-4949(314) 993-4945 Get Directions Write a Review

NPPES record last updated: November 3, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 3, 2025, Feb 16, 2023, Jul 9, 2021 and 2 more (5 updates tracked since 2016).

About Dr. Maisa A Nazzal M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MAISA A NAZZAL M.D. (NPI 1295991073) is an individual nephrology provider in Saint Louis, Missouri, licensed in Missouri (2016012961) and active in the NPI registry since August 2008. She is enrolled in Medicare PECOS, is affiliated with Ssm St Clare Health Center, and maintains a secondary practice location in Clayton.

NPPES Registry Identity

NPI1295991073
Entity TypeIndividualFemale
Primary Taxonomy207RN0300X
Provider Legal NameDR. MAISA A NAZZALCredential: M.D.
Location Address675 OLD BALLAS RD STE 104Saint Louis, MO 63141-7083
Mailing AddressPo Box 315Ballwin, MO 63022-0315 · (419) 508-6851
Phone(314) 993-4949
Fax(314) 993-4945
Sole ProprietorNo
Medical School CMSOtherGraduated 2000
Enumeration DateAugust 1, 2008
Last NPPES UpdateNovember 3, 20255 updates tracked since enumeration
NPPES CertifiedNovember 3, 2025
✔ NPI 1295991073 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
Licenses✔ Licensed in MO · 2016012961✔ Licensed in OK · 29008✔ Licensed in IL · 036147677✔ Licensed in AR · E7470
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
675 OLD BALLAS RD STE 104, Saint Louis, MO 63141
Open in Google Maps ↗

Secondary Practice Location 1

Location 1401 Corporate Park DrClayton, MO 63105-4201 · Phone (636) 288-4149

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Maisa A Nazzal M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9335368315
PECOS Enrollment IDI20160811000072
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Maisa Nazzal reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nice Nephrology, LLC
0.3 mi
Nephrology
555 N NEW BALLAS RD STE 210
Saint Louis, MO 63141
  • Reassigned Medicare billing, Missouri enrollment
NPI 1801492855 (314) 993-4949
Med Clinical Practice LLC
5.3 mi
Internal Medicine
401 CORPORATE PARK DR
Clayton, MO 63105
  • Reassigned Medicare billing, Missouri enrollment
  • 18 clinicians in this Medicare group
NPI 1699516690 (716) 292-6551

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
321 services78 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
228 services75 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
51 services45 patients
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221
Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.
49 services47 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
33 services23 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Ssm St Clare Health Center

Acute Care Hospitals · Fenton, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260081
Location1015 BowlesFenton, MO 63026 · Jefferson County
Emergency services Birthing friendly

Ssm Health St Mary's Hospital - St Louis

Acute Care Hospitals · Richmond Heights, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260091
Location6420 Clayton RdRichmond Heights, MO 63117 · St. Louis County
Emergency services Birthing friendly

Ssm Health Saint Louis University Hospital

Acute Care Hospitals · Saint Louis, MO
1/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number260105
Location3635 Vista AveSaint Louis, MO 63110 · St. Louis City County
Emergency services

Christian Hospital Northeast

Acute Care Hospitals · Saint Louis, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260180
Location11133 Dunn RoadSaint Louis, MO 63136 · St. Louis County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63141 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

QING CHEN MD
Internal Medicine (Nephrology)
675 OLD BALLAS RD STE 104
SAINT LOUIS, MO 63141
St. Louis County (314) 993-4949
COMPREHENSIVE CARE OF NEPHROLOGY, LLC
Internal Medicine (Nephrology)
675 OLD BALLAS RD STE 104
SAINT LOUIS, MO 63141
St. Louis County (636) 333-4500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Maisa Nazzal's NPI number?

The NPI number for Maisa Nazzal is 1295991073. It was assigned to this individual provider in the NPPES registry on August 1, 2008.

Where is Maisa Nazzal located?

Maisa Nazzal practices at 675 Old Ballas Rd Ste 104, Saint Louis, MO 63141. The listed phone number is (314) 993-4949.

What is Maisa Nazzal's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Maisa Nazzal enrolled in Medicare?

Yes. Maisa Nazzal is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Maisa Nazzal's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maisa Nazzal reassigns Medicare benefits to 2 organizations: Nice Nephrology, LLC (Saint Louis, MO) and Med Clinical Practice LLC (Clayton, MO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Maisa Nazzal's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Maisa Nazzal accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list Maisa Nazzal as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Maisa Nazzal affiliated with any hospitals?

According to CMS data, Maisa Nazzal is affiliated with Ssm St Clare Health Center, Ssm Health St Mary's Hospital - St Louis, Ssm Health Saint Louis University Hospital and Christian Hospital Northeast.

When was this NPI record last updated?

The NPPES record for Maisa Nazzal was last updated on November 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.