John Merkling, D.C.
NPI 1821095589 · Chiropractor · Woodstock, IL
Enrolled with Medicare as Practitioner - Chiropractic · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Merkling, D.C. is a Chiropractor provider in Woodstock, IL (NPI 1821095589).
Provider details
- NPI number
- 1821095589
- Entity type
- Individual
- Primary specialty
- ChiropractorChiropractic Providers
- Credential
- D.C.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 038006525 (IL)
Specialties & taxonomies
Chiropractic Providers
Chiropractic Providers
Chiropractic Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
1,025 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) |
|---|---|---|
| Chiropractic Manipulative Treatment, 1-2 Spinal Regions98940 | 654 | $26 |
| Chiropractic Manipulative Treatment, 3-4 Spinal Regions98941 | 371 | $37 |
Typical Medicare-allowed amounts for these services range $26–$37 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-07
- Last updated
- 2008-06-16
Frequently asked questions
- What is John Merkling's NPI number?
- John Merkling's National Provider Identifier (NPI) is 1821095589, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Merkling's specialty?
- John Merkling is listed in the NPPES registry with a primary specialty of Chiropractor (Chiropractic Providers).
- Where is John Merkling located?
- John Merkling's practice location on file with NPPES is 126 S Jefferson St, Woodstock, IL 60098-3438.
- What is John Merkling's phone number?
- The practice phone number listed in the NPPES registry for John Merkling is (815) 337-5500.
- Does John Merkling accept Medicare?
- John Merkling is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Merkling's NPI active?
- Yes — John Merkling's NPI (1821095589) is active in the NPPES registry as of the last update on 2008-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.