Doctor profile · Federal record
Dr. Mark Siedner, MD
Infectious Disease Physician (CMS: Infectious Disease) · Boston, MA
- NPI 1548429178
- Accepts Medicare
- 19 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
55 Fruit St, Massachusetts General Hospital Grj504
Boston, MA 021142621
(617) 726-3812
Credentials & registration
- NPI registered
- June 2008 — 18 yrs on file
- Profile last updated
- December 8, 2012
- Year of graduation
- 2007 — 19 yrs since
- Specialty taxonomy
- 207RI0200X — NUCC code
- State license (1)
- Massachusetts #253779
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1548429178. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
139
Distinct HCPCS
4
Medicare allowed
$16,635
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 63 | 24 | $84 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 35 | 24 | $126 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 27 | 27 | $184 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 14 | 14 | $138 |
In context: peer comparison
Among 71 peers in Boston Infectious Disease Physician, average services per provider: 59. This provider delivers 2.4× the peer median.Frequently asked questions
What is Dr. Mark Siedner's medical specialty?
Dr. Mark Siedner practices Infectious Disease Physician in Boston, MA.
Where does Dr. Mark Siedner practice?
Dr. Mark Siedner practices at 55 Fruit St, Boston, MA 021142621. Office phone: 6177263812.
What is Dr. Mark Siedner's NPI?
Dr. Mark Siedner's National Provider Identifier (NPI) is 1548429178, issued by NPPES.
Does Dr. Mark Siedner accept Medicare assignment?
Yes. Dr. Mark Siedner accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Siedner commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.