Dawn Williamson, PCNS
NPI 1912987074 · Psychiatric/Mental Health Nurse Practitioner · Boston, MA
Enrolled with Medicare as Practitioner - Certified Clinical Nurse Specialist (cns) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dawn Williamson, PCNS is a Psychiatric/Mental Health Nurse Practitioner provider in Boston, MA (NPI 1912987074).
Provider details
- NPI number
- 1912987074
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PCNS
- Sex
- Female
- Sole proprietor
- No
- License
- RN217173 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
218 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 106 | $69 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 101 | $43 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 11 | $146 |
Typical Medicare-allowed amounts for these services range $43–$146 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 736 Cambridge StBrighton, MA 02135-2907Phone: (617) 789-2102
Registry dates
- Enumerated
- 2006-01-17
- Last updated
- 2025-10-15
- Certified
- 2025-10-15
Frequently asked questions
- What is Dawn Williamson's NPI number?
- Dawn Williamson's National Provider Identifier (NPI) is 1912987074, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dawn Williamson's specialty?
- Dawn Williamson is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Dawn Williamson located?
- Dawn Williamson's practice location on file with NPPES is 55 Fruit St, Boston, MA 02114-2621.
- What is Dawn Williamson's phone number?
- The practice phone number listed in the NPPES registry for Dawn Williamson is (617) 643-2307.
- Does Dawn Williamson accept Medicare?
- Dawn Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dawn Williamson's NPI active?
- Yes — Dawn Williamson's NPI (1912987074) is active in the NPPES registry as of the last update on 2025-10-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.