John Greaves, M.D.
NPI 1821221136 · Anatomic Pathology & Clinical Pathology Physician · Redding, CA
John Greaves, M.D. is a Anatomic Pathology & Clinical Pathology Physician provider in Redding, CA (NPI 1821221136).
Provider details
- NPI number
- 1821221136
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- C37307 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
16 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$148 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-09-02
- Last updated
- 2009-09-02
Frequently asked questions
- What is John Greaves's NPI number?
- John Greaves's National Provider Identifier (NPI) is 1821221136, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Greaves's specialty?
- John Greaves is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is John Greaves located?
- John Greaves's practice location on file with NPPES is 15742 Middletown Park Dr, Redding, CA 96001-9753.
- What is John Greaves's phone number?
- The practice phone number listed in the NPPES registry for John Greaves is (530) 244-1299.
- Is John Greaves's NPI active?
- Yes — John Greaves's NPI (1821221136) is active in the NPPES registry as of the last update on 2009-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.