Karl Greer, MD
NPI 1396010740 · Family Medicine Physician · Rohnert Park, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karl Greer, MD is a Family Medicine Physician provider in Rohnert Park, CA (NPI 1396010740).
Provider details
- NPI number
- 1396010740
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A127109 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
76 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 | 35 | $81 |
| Initial Hospital Care With Same-Day Admission and Discharge With High Level of Medical Decision Making, Per Day, If Using Time, at Least 85 Minutes99236 | 22 | $213 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 19 | $178 |
Typical Medicare-allowed amounts for these services range $81–$213 (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 · 78 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 122 | 34 |
| Losartan Potassium | 98 | 34 |
| Amlodipine Besylate | 86 | 31 |
| Gabapentin | 65 | 23 |
| Trazodone Hcl | 63 | 19 |
| Levothyroxine Sodium | 58 | 19 |
| Furosemide | 54 |
Practice location
Mailing address
Additional practice locations (1)
- 1179 N Mcdowell BlvdPetaluma, CA 94954-6559Phone: (707) 559-7500Fax: (707) 559-7620
Registry dates
- Enumerated
- 2012-03-19
- Last updated
- 2021-02-01
- Certified
- 2021-02-01
Frequently asked questions
- What is Karl Greer's NPI number?
- Karl Greer's National Provider Identifier (NPI) is 1396010740, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karl Greer's specialty?
- Karl Greer is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karl Greer located?
- Karl Greer's practice location on file with NPPES is 5900 State Farm Dr Fl 2, Rohnert Park, CA 94928-2149.
- What is Karl Greer's phone number?
- The practice phone number listed in the NPPES registry for Karl Greer is (707) 559-7600.
- Does Karl Greer accept Medicare?
- Karl Greer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karl Greer's NPI active?
- Yes — Karl Greer's NPI (1396010740) is active in the NPPES registry as of the last update on 2021-02-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.