Ann Chamberlain, NP
NPI 1851984330 · Gerontology Nurse Practitioner · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ann Chamberlain, NP is a Gerontology Nurse Practitioner provider in Grand Rapids, MI (NPI 1851984330).
Provider details
- NPI number
- 1851984330
- Entity type
- Individual
- Primary specialty
- Gerontology Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 4704289609 (MI)
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
5 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
281 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 | 104 | $67 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 94 | $102 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 44 | $154 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 39 | $109 |
Typical Medicare-allowed amounts for these services range $67–$154 (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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Daptomycin | 47 | — |
| Ceftriaxone Sodiumbrand: Ceftriaxone | 41 | — |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 40 | 13 |
| Meropenem | 33 | — |
| Vancomycin Hcl | 32 | — |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 27 | 14 |
| Fluconazole | 23 | 14 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-02-16
- Last updated
- 2025-03-06
- Certified
- 2025-03-06
Frequently asked questions
- What is Ann Chamberlain's NPI number?
- Ann Chamberlain's National Provider Identifier (NPI) is 1851984330, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ann Chamberlain's specialty?
- Ann Chamberlain is listed in the NPPES registry with a primary specialty of Gerontology Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Ann Chamberlain located?
- Ann Chamberlain's practice location on file with NPPES is 230 Michigan St Ne Ste 230, Grand Rapids, MI 49503-2550.
- What is Ann Chamberlain's phone number?
- The practice phone number listed in the NPPES registry for Ann Chamberlain is (616) 774-2822.
- Does Ann Chamberlain accept Medicare?
- Ann Chamberlain is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ann Chamberlain's NPI active?
- Yes — Ann Chamberlain's NPI (1851984330) is active in the NPPES registry as of the last update on 2025-03-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.