Joshua SIU Lim Ng, MDCM, MPH

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

• Massachusetts General Hospital Hospital · Boston, MA
• North Shore Medical Center Hospital · Salem, MA

Colleagues at Massachusetts General Physicians Organization Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3484 clinicians in the practice; 12 are shown here.

• Leah Ahern, RD Registered Dietitian · Boston, MA
• Dr. Mathew M Avram, MD Dermatology Physician · Boston, MA
• Marley Cowell, PA-C Physician Assistant · Boston, MA
• Celeste Jeannine Maria Day, CRNA Certified Registered Nurse Anesthetist · Boston, MA
• Dr. Walter H Dzik, MD Internal Medicine Physician · Boston, MA
• Dr. David Lawlor, MD Surgery Physician · Boston, MA
• Dr. Michael Edward Markowski, DO Neurology Physician · Hyannis, MA
• Julia Pesci Maternal Newborn Registered Nurse · Boston, MA
• Anne Ryther Nurse Practitioner · Boston, MA
• Hensin Tsao, MD Dermatology Physician · Boston, MA
• Sarah Margaret Urbut, MD Student in an Organized Health Care Education/Training Program · Boston, MA
• Dr. Michael E Zalis, MD Diagnostic Radiology Physician · Boston, MA

Other providers in Boston

• Dr. David Ricahrd King, MD

  Individual Surgical Critical Care Physician · NPI 1851493514

  15 Parkman St Wang 455, Boston, MA 02114-3117 · (617) 726-2760

• Dr. Kristin Anne Madenci, MD

  Individual Surgical Critical Care Physician · NPI 1508017260

  75 Francis St, Boston, MA 02115-6110 · (262) 366-9785

• Arfry Minier Marcelino-Tineo, MD

  Individual Surgical Critical Care Physician · NPI 1386091197

  300 Brookline Ave, Boston, MA 02215-5403 · (617) 632-9922

• David Miranda, MD

  Individual Surgical Critical Care Physician · NPI 1275987299

  55 Fruit St, Boston, MA 02114-2696 · (866) 925-4767

• Dr. Jonathan Parks, MD

  Individual Surgical Critical Care Physician · NPI 1598027484

  165 Cambridge St Ste 810, Boston, MA 02114-2747 · (617) 726-9591

• Vihas Patel, MD

  Individual Surgical Critical Care Physician · NPI 1194703090

  75 Francis St Brigham And Womens Hospital Dept OF Surgery, Boston, MA 02115-6110 · (617) 525-9327

• Aaron P Richman, MD

  Individual Surgical Critical Care Physician · NPI 1700152592

  725 Albany Street Shapiro 3 Ste A, Boston, MA 02118 · (617) 414-4861

• Dane R Scantling, DO

  Individual Surgical Critical Care Physician · NPI 1497168827

  725 Albany St Ste 3B Shapiro Bldg, Boston, MA 02118 · (617) 414-4861