Gregory Thalken, MD
NPI 1861547317 · Diagnostic Radiology Physician · Long Beach, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Thalken, MD is a Diagnostic Radiology Physician provider in Long Beach, CA (NPI 1861547317).
Provider details
- NPI number
- 1861547317
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C162624 (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
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
9 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,489 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) |
|---|---|---|
| Ct Scan Head Or Brain Without Contrast70450 | 320 | $37 |
| Ct Scan of Blood Vessels of Head With Contrast70496 | 216 | $78 |
| Ct Scan of Blood Vessels of Neck With Contrast70498 | 215 | $75 |
| X-Ray of Chest, 1 View71045 | 134 | $8 |
| Ct Scan of Upper Spine Without Contrast72125 | 86 | $43 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 84 | $81 |
| Mri Scan of Brain Without Contrast |
Practice location
Mailing address
Additional practice locations (8)
- 4301 W Markham St # 556Little Rock, AR 72205-7101Phone: (501) 296-1095Fax: (501) 526-5919
- 4440 W 95th StOak Lawn, IL 60453-2600Phone: (708) 684-8000Fax: (708) 520-1039
- 6125 Ranier Ln NPlymouth, MN 55446-2072Phone: (858) 546-3800Fax: (858) 546-3900
- 1 Capital WayPennington, NJ 08534-2520Phone: (609) 303-4000
- 310 Salem Woodstown RdSalem, NJ 08079-2064Phone: (856) 935-1000
- 750 Brunswick AveTrenton, NJ 08638-4143Phone: (609) 394-6000
- 500 Martha Jefferson DrCharlottesville, VA 22911-4668Phone: (434) 654-7000
- 2010 Health Campus DrRockingham, VA 22801-8679Phone: (540) 432-8950
Registry dates
- Enumerated
- 2007-01-24
- Last updated
- 2026-05-06
- Certified
- 2026-05-06
Frequently asked questions
- What is Gregory Thalken's NPI number?
- Gregory Thalken's National Provider Identifier (NPI) is 1861547317, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Thalken's specialty?
- Gregory Thalken is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Thalken located?
- Gregory Thalken's practice location on file with NPPES is 2801 Atlantic Ave, Long Beach, CA 90806-1701.
- What is Gregory Thalken's phone number?
- The practice phone number listed in the NPPES registry for Gregory Thalken is (562) 933-1550.
- Does Gregory Thalken accept Medicare?
- Gregory Thalken is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Thalken's NPI active?
- Yes — Gregory Thalken's NPI (1861547317) is active in the NPPES registry as of the last update on 2026-05-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.