Office listed in NPPES
800 Washington St, Boston, MA 02111
6176361400
Confirm this address and number with the practice. Registry information may be outdated.
Physician registry profile
Mark Gregory Sperry
M.D. · Boston, MA
Record details
- NPI
- 1376773754
- Registry updated
- 07/20/2009
- Imported
- 2026-11-03
- Registry specialty labels (English)
- Internal Medicine
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Confirm current services, ages treated, insurance, location, hospital affiliations and appointment availability directly with the practice. An active NPI does not verify current licensure, certification or practice status.
A registry specialty label does not establish that a clinician currently provides the particular care you need.
Documented Medicare service activity
Reporting year: 2024. These are billed services or units in Original Medicare Part B, not total career experience, all patients, surgical case counts or a quality rating.
Scroll the table sideways to see every column.
| HCPCS | Billed services / units | Beneficiaries in this row | Service description (English) | Billing setting |
|---|---|---|---|---|
| 94010 | 33 | 31 | Test to measure expiratory airflow and volume | Facility |
| 94060 | 25 | 25 | Test to measure expiratory airflow and volume changes before and after medication administration | Facility |
| 94618 | 13 | 13 | Test for exercise-induced lung stress | Facility |
| 94626 | 84 | 15 | Professional services for outpatient pulmonary rehabilitation with continuous monitoring of blood oxygen, per session | Facility |
| 94726 | 34 | 34 | Test to determine lung volumes using sensors | Facility |
| 94729 | 41 | 41 | Test to examine how well the lungs exchange gases | Facility |
| 99213 | 56 | 53 | Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Non-facility |
| 99214 | 69 | 61 | Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Non-facility |
| 99222 | 28 | 28 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Facility |
| 99232 | 39 | 27 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Facility |
| 99233 | 28 | 19 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Facility |
| 99291 | 55 | 30 | Critical care, first 30-74 minutes | Facility |
How to interpret these counts
CMS suppresses provider/service rows involving fewer than 11 beneficiaries. Services may repeat for one person, and beneficiaries cannot be added across rows. Facility/non-facility describes billing and does not establish a current hospital affiliation. These counts do not report case complexity, clinical outcomes or whether a treatment is appropriate for you.
Exact CMS source rows for this NPI · Checked 2026-11-03