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Gregory Nizialek

NPI 1124386552 · Internal Medicine Physician · Baltimore, MD

Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Provider details

NPI number: 1124386552
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense D0087449 (MD)
Allopathic & Osteopathic Physicians
Student in an Organized Health Care Education/Training Program390200000X
Student, Health Care

Profile Score

Established profile(61/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
14 yrs in NPPES registry
Profile completeness28% of score
83% of core fields populated
Practice footprint17% of score
3 documented practice locations
Medicare service volume (vs. specialty peers)28% of score
164 Medicare services, 2024 (ranked within specialty)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233	111	$119
Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223	30	$176
Hospital Discharge Day Management, More Than 30 Minutes99239	23	$117

Typical Medicare-allowed amounts for these services range $117–$176 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

Practice location

9000 Franklin Square Dr

Baltimore, MD 21237-3901

Phone: (443) 777-7000

Street-level locationGet directions

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Mailing address