Holly Maas, LMSW
NPI 1033159660 · Clinical Social Worker · Iowa City, IA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Holly Maas, LMSW is a Clinical Social Worker provider in Iowa City, IA (NPI 1033159660).
Provider details
- NPI number
- 1033159660
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LMSW
- Sex
- Female
- Sole proprietor
- No
- License
- 06176 (IA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service 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
450 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) |
|---|---|---|
| Psychotherapy, 45 Minutes90834 | 290 | $65 |
| Psychotherapy, 1 Hour90837 | 102 | $96 |
| Psychotherapy, 45 Minutes90834 | 36 | $74 |
| Psychotherapy, 30 Minutes90832 | 22 | $49 |
Typical Medicare-allowed amounts for these services range $49–$96 (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
- 2006-06-08
- Last updated
- 2011-02-09
Frequently asked questions
- What is Holly Maas's NPI number?
- Holly Maas's National Provider Identifier (NPI) is 1033159660, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Holly Maas's specialty?
- Holly Maas is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Holly Maas located?
- Holly Maas's practice location on file with NPPES is 200 Hawkins Dr, Iowa City, IA 52242-1009.
- What is Holly Maas's phone number?
- The practice phone number listed in the NPPES registry for Holly Maas is (319) 353-6314.
- Does Holly Maas accept Medicare?
- Holly Maas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Holly Maas's NPI active?
- Yes — Holly Maas's NPI (1033159660) is active in the NPPES registry as of the last update on 2011-02-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.