Active NPI 1710076773 Individual Practitioner Male Practitioner

Dr. Peter James Mazolewski , MD

Surgery • Walnut Creek, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Peter Mazolewski, MD is a certified Surgery practicing in Walnut Creek, CA. With approximately 32 years of clinical experience since graduating from University Of Southern California Keck School Of Medicine in 1994, Dr. Mazolewski delivers high-quality medical care to the local community at 365 LENNON LN STE 290.

Dr. Mazolewski is affiliated with Bass Medical Group and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, initial hospital care with moderate level of medical decision making, if using time, at least, new patient outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

365 Lennon Ln Ste 290

Walnut Creek, CA 945985915

Telephone 9256585076

Fax 9256585089

Medicare Profile & Education

Medical School

University Of Southern California Keck School Of Medicine

Graduation Year

1994

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Surgery in Walnut Creek, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

32 Yrs +9.2 yrs vs City Avg

City Avg: 22.8 Yrs

State Avg: 27.4 Yrs

Regional Practice Density

33 Specialists

Practicing in Walnut Creek, CA (3346 Statewide)

Telehealth Adoption Rate

15.2% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

64.1% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Mazolewski (32 Years) 32 Yrs

Walnut Creek Specialty Average (22.8 Years) 22.8 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	128	69	$237.00	$92.86
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	71	70	$663.00	$204.36
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	17	14	$342.00	$140.25
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	16	16	$585.00	$210.26
47562 Removal of gallbladder using an endoscope	13	13	$2132.00	$772.99

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	135	68	$237.00	$89.16
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	81	79	$663.00	$196.52
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	20	18	$342.00	$129.72
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	17	15	$460.00	$153.41
47562 Removal of gallbladder using an endoscope	16	16	$2158.63	$692.03
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	12	12	$585.00	$197.49

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	130	73	$237.00	$80.00
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	82	78	$663.00	$222.12
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	26	24	$460.00	$152.89
47562 Removal of gallbladder using an endoscope	22	22	$2132.00	$742.23
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	21	15	$342.00	$115.65
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	14	14	$585.00	$196.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	125	77	$237.00	$81.22
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	117	114	$663.00	$226.23
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	29	25	$342.00	$116.80
47562 Removal of gallbladder using an endoscope	25	25	$2183.16	$730.86
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	24	18	$449.00	$155.07
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	21	21	$581.14	$198.00

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	108	108	$663.00	$228.70
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	101	67	$237.00	$81.90
47562 Removal of gallbladder using an endoscope	34	34	$2169.59	$712.64
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	21	21	$558.00	$192.00
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	19	17	$342.00	$118.52
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	17	15	$372.00	$129.07

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	150	76	$237.00	$80.78
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	119	115	$661.82	$226.50
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	19	19	$558.00	$192.11
47562 Removal of gallbladder using an endoscope	19	19	$2221.68	$715.87
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	18	16	$372.00	$129.19
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	17	11	$342.00	$117.18

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	185	100	$220.16	$81.18
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	120	118	$620.53	$225.61
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	25	25	$516.64	$189.81
47562 Removal of gallbladder using an endoscope	24	24	$2043.42	$704.18
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	18	16	$353.94	$126.20
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	13	13	$409.08	$151.99

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	140	68	$199.00	$79.39
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	76	75	$555.00	$222.23
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	35	35	$464.00	$180.94
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	32	23	$307.00	$120.23
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	23	23	$374.00	$149.64
47562 Removal of gallbladder using an endoscope	21	21	$1921.43	$642.71
99213 Established patient office or other outpatient visit, typically 15 minutes	17	15	$208.00	$84.32
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	13	13	$308.00	$123.46
64784 Removal of growth of peripheral nerve	12	12	$1200.00	$816.60
49505 Repair of groin hernia (5 years or older)	12	12	$1416.00	$330.82

Medical Specialties & State Licenses

CMS Verified: 2025-02-26

Surgery Primary Specialty

NUCC Taxonomy Code: 208600000X

State License CA A84094

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Specialist

NUCC Taxonomy Code: 174400000X

State License CA A84094

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

Hospital & Practice Group Affiliations

Bass Medical Group

1505 Saint Alphonsus Way, Alamo, CA 945071570

Phone: 9259326330

Bass Medical Group

365 Lennon Ln, Walnut Creek, CA 945985915

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

2 Associated Practitioners

Dr. Negar Salehomoum , MD

Surgery

NPI 1013169911

Doctor of Medicine (M.D.)

Dr. Poornima Vanguri , MD

Colon & Rectal Surgery

NPI 1144457375

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

10 Historical Events

📍

Updated Practice Location February 26, 2025

Registered at 365 LENNON LN STE 290, WALNUT CREEK, CA 945985915 (Tel: 9256585076)

📍

Updated Business Mailing Address February 26, 2025

Registered at 365 LENNON LN STE 290, WALNUT CREEK, CA 945985915

📍

Updated Practice Location February 22, 2021

Registered at 2637 SHADELANDS DR, WALNUT CREEK, CA 945982512 (Tel: 9259326330)

📍

Updated Business Mailing Address February 22, 2021

Registered at 2637 SHADELANDS DR, WALNUT CREEK, CA 945982512 (Tel: 9259326330)

✅

NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍

Updated Practice Location July 08, 2007

Registered at 130 LA CASA VIA, BUILDING 3, SUITE 211, WALNUT CREEK, CA 945983045 (Tel: 9259330984)

📍

Updated Business Mailing Address July 08, 2007

Registered at 130 LA CASA VIA, BUILDING 3, SUITE 211, WALNUT CREEK, CA 945983045 (Tel: 9259330984)

👤

Provider Name / Credentials Updated July 08, 2007

Recorded as PETER MAZOLEWSKI, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Specialist (License #A84094 in CA)

🟢

Initial NPI Registration & Enumeration October 11, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1710076773

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: October 11, 2006

Last Update: February 26, 2025

Sole Proprietor: No

Update or Correct Profile

Mailing Address

365 Lennon Ln Ste 290

Walnut Creek, CA 945985915

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.