David Johnson, RN/NP
NPI 1821373671 · Psychiatric/Mental Health Nurse Practitioner · Cambridge, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Johnson, RN/NP is a Psychiatric/Mental Health Nurse Practitioner provider in Cambridge, MA (NPI 1821373671).
Provider details
- NPI number
- 1821373671
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN/NP
- Sex
- Male
- Sole proprietor
- No
- License
- RN2263400 (MA)
Specialties & taxonomies
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
14 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
204 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 140 | $116 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 45 | $64 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 19 | $53 |
Typical Medicare-allowed amounts for these services range $53–$116 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 38 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lorazepam | 186 | 24 |
| Clonazepam | 157 | 27 |
| Bupropion Hclbrand: Bupropion Xl | 121 | 25 |
| Sertraline Hcl | 110 | 25 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 106 | — |
| Quetiapine Fumarate | 99 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-10-12
- Last updated
- 2011-10-12
Frequently asked questions
- What is David Johnson's NPI number?
- David Johnson's National Provider Identifier (NPI) is 1821373671, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Johnson's specialty?
- David Johnson is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is David Johnson located?
- David Johnson's practice location on file with NPPES is 1611 Cambridge St, Cambridge, MA 02138-4302.
- What is David Johnson's phone number?
- The practice phone number listed in the NPPES registry for David Johnson is (617) 661-5500.
- Does David Johnson accept Medicare?
- David Johnson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Johnson's NPI active?
- Yes — David Johnson's NPI (1821373671) is active in the NPPES registry as of the last update on 2011-10-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.