Doctor profile · Federal record

Dr. Gregory Nizialek

Internal Medicine Physician (CMS: Internal Medicine) · Student in an Organized Health Care Education/Training Program · Baltimore, MD

  • NPI 1124386552
  • Accepts Medicare
  • MIPS 79.1 / 100 · 2023
  • 14 yrs in practice
  • Male
  • Group practice
  • No sanctions

Practice & contact

Operates at 3 locations .

NPPES Updated May 11, 2026
Primary practice
9000 Franklin Square Dr
Baltimore, MD 212373901
(443) 777-7000
Additional location
2500 Metrohealth Dr
Cleveland, OH 441091900
(216) 778-4486
Additional location
3001 S Hanover St
Baltimore, MD 212251233
(410) 350-3200

Credentials & registration

NPPES · NUCC
NPI registered
April 2012 — 14 yrs on file
Profile last updated
July 3, 2019
Year of graduation
2012 — 14 yrs since
Specialty taxonomy
207R00000X — NUCC code
State license (1)
Maryland #D0087449

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1124386552. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
180
Distinct HCPCS
4
Medicare allowed
$23,285
HCPCS Description Services Patients Avg allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 115 41 $124
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 30 30 $181
99239 Hospital discharge day management, more than 30 minutes 19 19 $120
99238 Hospital discharge day management, 30 minutes or less 16 16 $84

In context: peer comparison

Among 363 peers in Baltimore Internal Medicine Physician, average services per provider: 105. This provider delivers 1.7× the peer median.

Hospital affiliations

CMS Hospital Compare

Frequently asked questions

Auto-generated from federal data
What is Dr. Gregory Nizialek's medical specialty?
Dr. Gregory Nizialek practices Internal Medicine Physician in Baltimore, MD.
Where does Dr. Gregory Nizialek practice?
Dr. Gregory Nizialek practices at 9000 Franklin Square Dr, Baltimore, MD 212373901. Office phone: 4437777000.
What is Dr. Gregory Nizialek's NPI?
Dr. Gregory Nizialek's National Provider Identifier (NPI) is 1124386552, issued by NPPES.
Does Dr. Gregory Nizialek accept Medicare assignment?
Yes. Dr. Gregory Nizialek accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Nizialek commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Initial hospital care with moderate level of medical decision making (HCPCS 99223); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.