Providers
CARL MICHAEL RIDDELL, M.D., F.A.C.O.G.
NPI 1497966808, individual, Little Rock, AR, Obstetrics & Gynecology, Obstetrics
4
Evidence tier
structure or single-organization volume
- Hours beyond a day in 44 months, but with up to 2850 patients a month, which points to a supervising clinician on the claims rather than one person's hours.
- Records needed.
- Medicaid dollars per patient on code 99401 ($48 per patient-month) sit in the top 5% of every provider billing that code.
score 56 of 100, rank 7402, $7.3M at stake
Hours billed per day
Medicaid billing converted into hours of hands-on care per day. The lower bound counts one unit per claim line and needs no price; the other two divide dollars by a unit price, the conservative one at 1.5 times the price. The clinician on the claim may be a supervisor under state rules, so billing organizations are counted too.
| month | what was found | hours per day, lower bound | hours per day, at price | hours per day, conservative | per working day | patients | billing organizations | codes | paid |
|---|---|---|---|---|---|---|---|---|---|
| Jan 2018 | More hours than a day holds, even counting one unit per claim line | 41.7 | 49.5 | 33.0 | 44.4 | 2850 | 2 | 99203 99212 99215 99401 99402 | $151K |
| Feb 2018 | More hours than a day holds, even counting one unit per claim line | 42.2 | 48.8 | 32.5 | 45.6 | 2607 | 2 | 99203 99211 99212 99215 99401 99402 | $135K |
| Mar 2018 | More hours than a day holds, even counting one unit per claim line | 38.4 | 43.7 | 29.1 | 41.1 | 2645 | 2 | 99203 99212 99215 99401 99402 | $135K |
| Apr 2018 | More hours than a day holds, even counting one unit per claim line | 38.9 | 43.6 | 29.1 | 41.5 | 2591 | 2 | 99203 99211 99212 99401 99402 | $131K |
| May 2018 | More hours than a day holds, even counting one unit per claim line | 37.8 | 43.8 | 29.2 | 39.4 | 2683 | 2 | 99203 99212 99401 99402 | $136K |
| Jun 2018 | More hours than a day holds, even counting one unit per claim line | 37.9 | 41.9 | 28.0 | 39.9 | 2537 | 2 | 99203 99212 99401 99402 | $126K |
| Jul 2018 | More hours than a day holds, even counting one unit per claim line | 32.8 | 40.0 | 26.7 | 37.6 | 2318 | 2 | 99203 99212 99401 99402 | $124K |
| Aug 2018 | More hours than a day holds, even counting one unit per claim line | 36.8 | 45.6 | 30.4 | 40.9 | 2639 | 2 | 99203 99211 99212 99401 99402 | $140K |
| Sep 2018 | More hours than a day holds, even counting one unit per claim line | 34.5 | 40.8 | 27.2 | 40.8 | 2311 | 2 | 99203 99212 99401 99402 | $123K |
| Oct 2018 | More hours than a day holds, even counting one unit per claim line | 36.6 | 44.1 | 29.4 | 39.6 | 2554 | 2 | 99203 99212 99401 99402 | $136K |
| Nov 2018 | More hours than a day holds, even counting one unit per claim line | 33.0 | 40.7 | 27.1 | 37.0 | 2320 | 2 | 99203 99212 99401 99402 | $121K |
| Dec 2018 | More hours than a day holds, even counting one unit per claim line | 29.2 | 37.4 | 24.9 | 36.8 | 2202 | 2 | 99203 99212 99401 99402 | $114K |
| Jan 2019 | More hours than a day holds, even counting one unit per claim line | 39.4 | 60.7 | 40.5 | 54.5 | 2793 | 2 | 99203 99212 99214 99401 99402 | $148K |
| Feb 2019 | More hours than a day holds, even counting one unit per claim line | 37.9 | 57.7 | 38.5 | 53.8 | 2434 | 2 | 99203 99212 99401 99402 | $130K |
| Mar 2019 | More hours than a day holds, even counting one unit per claim line | 33.8 | 46.9 | 31.2 | 46.1 | 2314 | 2 | 99203 99211 99212 99401 99402 | $116K |
| Apr 2019 | More hours than a day holds, even counting one unit per claim line | 40.5 | 56.4 | 37.6 | 51.2 | 2699 | 2 | 99203 99211 99212 99401 99402 | $138K |
| May 2019 | More hours than a day holds, even counting one unit per claim line | 33.5 | 46.7 | 31.1 | 41.9 | 2365 | 2 | 99203 99212 99401 99402 | $117K |
| Jun 2019 | More hours than a day holds, even counting one unit per claim line | 31.4 | 42.7 | 28.4 | 42.7 | 2154 | 2 | 99203 99212 99401 99402 | $103K |
| Jul 2019 | More hours than a day holds, even counting one unit per claim line | 34.0 | 50.7 | 33.8 | 45.6 | 2405 | 2 | 99203 99212 99401 99402 | $126K |
| Aug 2019 | More hours than a day holds, even counting one unit per claim line | 31.7 | 46.4 | 31.0 | 43.6 | 2232 | 2 | 99203 99212 99401 99402 | $118K |
| Sep 2019 | More hours than a day holds, even counting one unit per claim line | 29.3 | 43.5 | 29.0 | 41.5 | 2025 | 2 | 99203 99211 99212 99401 99402 | $107K |
| Oct 2019 | More hours than a day holds, even counting one unit per claim line | 29.4 | 46.7 | 31.1 | 41.9 | 2153 | 2 | 99203 99212 99401 99402 | $116K |
| Nov 2019 | More hours than a day holds, even counting one unit per claim line | 24.7 | 38.4 | 25.6 | 36.6 | 1737 | 2 | 99203 99212 99401 99402 | $94K |
| Dec 2019 | More hours than a day holds at a conservative unit price | 22.9 | 37.4 | 25.0 | 35.2 | 1733 | 2 | 99203 99212 99401 99402 | $92K |
| Jan 2020 | More hours than a day holds, even counting one unit per claim line | 28.3 | 32.7 | 21.8 | 29.3 | 2091 | 2 | 99203 99212 99401 99402 | $112K |
| Feb 2020 | More hours than a day holds, even counting one unit per claim line | 24.8 | 28.4 | 18.9 | 27.4 | 1703 | 2 | 99203 99211 99212 99401 99402 | $92K |
| Jan 2022 | More hours than a day holds at a conservative unit price | 18.8 | 38.5 | 25.7 | 37.9 | 1430 | 2 | 99203 99212 99401 99402 | $82K |
| Feb 2022 | More hours than a day holds at a conservative unit price | 19.4 | 39.1 | 26.1 | 36.5 | 1327 | 2 | 99203 99212 99401 99402 | $75K |
| Mar 2022 | More hours than a day holds, even counting one unit per claim line | 24.3 | 47.0 | 31.3 | 42.2 | 1799 | 2 | 99203 99212 99401 99402 | $103K |
| Apr 2022 | More hours than a day holds at a conservative unit price | 22.6 | 41.7 | 27.8 | 39.8 | 1626 | 2 | 99203 99212 99401 99402 | $91K |
| May 2022 | More hours than a day holds at a conservative unit price | 20.9 | 39.4 | 26.2 | 37.0 | 1588 | 2 | 99203 99212 99401 99402 | $86K |
| Jun 2022 | More hours than a day holds at a conservative unit price | 22.8 | 40.8 | 27.2 | 37.1 | 1639 | 2 | 99203 99212 99401 99402 | $89K |
| Jul 2022 | More hours than a day holds at a conservative unit price | 20.5 | 43.0 | 28.7 | 42.4 | 1551 | 2 | 99203 99212 99401 99402 | $91K |
| Aug 2022 | More hours than a day holds at a conservative unit price | 23.4 | 47.8 | 31.8 | 42.9 | 1769 | 2 | 99203 99212 99401 99402 | $103K |
| Sep 2022 | More hours than a day holds at a conservative unit price | 21.4 | 43.8 | 29.2 | 39.8 | 1545 | 2 | 99203 99212 99401 99402 | $90K |
| Oct 2022 | More hours than a day holds at a conservative unit price | 21.9 | 45.9 | 30.6 | 45.2 | 1675 | 2 | 99203 99212 99401 99402 | $98K |
| Nov 2022 | More hours than a day holds at a conservative unit price | 19.7 | 43.7 | 29.1 | 39.7 | 1493 | 2 | 99203 99212 99401 99402 | $86K |
| Dec 2022 | More hours than a day holds at a conservative unit price | 18.0 | 40.3 | 26.9 | 37.9 | 1414 | 2 | 99203 99212 99401 99402 | $81K |
| Feb 2023 | More hours than a day holds, even counting one unit per claim line | 25.1 | 34.9 | 23.2 | 32.5 | 1728 | 2 | 99203 99212 99401 99402 | $98K |
| Mar 2023 | More hours than a day holds, even counting one unit per claim line | 26.2 | 34.6 | 23.0 | 31.0 | 1920 | 2 | 99203 99212 99401 99402 | $109K |
| Apr 2023 | More hours than a day holds, even counting one unit per claim line | 25.1 | 31.0 | 20.7 | 31.0 | 1759 | 2 | 99203 99212 99401 99402 | $96K |
| May 2023 | More hours than a day holds, even counting one unit per claim line | 25.0 | 32.0 | 21.3 | 28.7 | 1895 | 2 | 99203 99212 99401 99402 | $101K |
| Jun 2023 | More hours than a day holds, even counting one unit per claim line | 24.4 | 29.9 | 19.9 | 27.2 | 1737 | 2 | 99203 99212 99401 99402 | $92K |
| Aug 2023 | More hours than a day holds, even counting one unit per claim line | 24.9 | 30.2 | 20.1 | 27.1 | 1674 | 2 | 99203 99212 99401 99402 | $96K |
National provider registry
From the CMS NPPES Registry, refreshed daily.
| Name | CARL MICHAEL RIDDELL, M.D., F.A.C.O.G. (also MIKE RIDDELL) |
| Type | Individual |
| Status | Active |
| NPI issued | May 25, 2007, last updated January 29, 2014 |
| Practice location | 5800 W 10TH ST, STE.401, Little Rock, AR 72204-1752, 501-661-2480 |
| Specialties | Obstetrics & Gynecology, Obstetrics (207VX0000X, primary, license C-5991 AR) |
Procedures billed
The specific codes behind the dollars. Medicaid figures come from T-MSIS (2018 to 2024) and are compared with every other provider billing the same code; Medicare figures come from the 2024 physician and supplier file and compare this provider's submitted charge with what Medicare allowed, against the usual ratio for that code.
Medicaid, largest codes
| code | what it is | paid | share | per patient-month | typical | rank among providers | |
|---|---|---|---|---|---|---|---|
| 99402 | Preventive counseling individual 30 min | $3.7M | 19% | $63 | $36 (top 5% from $131) | 72nd percentile | |
| 99401 | Preventive counseling individual 15 min | $3.3M | 17% | $48 | $16 (top 5% from $46) | 96th percentile | |
| J7307 | Medicaid service code | $2.4M | 12% | $408 | $827 (top 5% from $1K) | 18th percentile | |
| 87491 | Detection test by nucleic acid for chlamydia trachomatis, amplified probe technique | $2.1M | 11% | $48 | $27 (top 5% from $50) | 94th percentile | |
| 87591 | Detection test by nucleic acid for neisseria gonorrhoeae (gonorrhoeae bacteria), amplified probe technique | $2.1M | 11% | $48 | $26 (top 5% from $46) | 96th percentile | |
| J1050 | Injection, medroxyprogesterone acetate, 1 mg | $1.1M | 6% | $21 | $51 (top 5% from $98) | 32nd percentile | |
| 11981 | Insertion of drug delivery implant into tissue | $924K | 5% | $157 | $164 (top 5% from $305) | 48th percentile | |
| 87389 | Detection test by immunoassay technique for hiv-1 antigen and hiv-1 and hiv-2 antibodies | $799K | 4% | $31 | $19 (top 5% from $42) | 88th percentile |
Medicare Part B 2024, largest codes
| code | what it is | services | beneficiaries | paid | submitted per service | allowed per service | charge to allowed | usual for this code |
|---|---|---|---|---|---|---|---|---|
| 96372 | Injection of drug or substance under skin or into muscle | 100 | 51 | $560 | $24 | $12 | 2.0x | 3.6x (90th percentile 6.4x) |
| 81025 | Urine pregnancy test | 47 | 30 | $389 | $13 | $8 | 1.5x | 3.4x (90th percentile 7.8x) |
| J1050 | Injection, medroxyprogesterone acetate, 1 mg | 14,850 | 50 | $67 | $1 | $0 | 58.4x |
A submitted charge many times the allowed amount is common and lawful; it matters when it is far above what other providers submit for the same code.
In this area
8 providers in Pulaski County, AR carry an indicator in the public record, with $12.7M at stake between them. The most common is more hours than a day holds, on 6 of them, followed by named in an enforcement record on 2.
| tier | provider | at stake | why |
|---|---|---|---|
| 3 | KRAMEELAH BANKS Little Rock, AR, ranked 2462 | $0 |
|
| 3 | ARKANSAS BEHAVIORAL CENTER (ABC), LLC Little Rock, AR, ranked 5190 | $0 |
|
| 4 | NAVEEN PATIL Little Rock, AR, ranked 7428 | $5.9M |
|
| 4 | LAWRENCE LABBATE Little Rock, AR, ranked 7599 | $2.7M |
|
| 4 | BRIAN SIMPSON Little Rock, AR, ranked 7646 | $2.3M |
|
| 4 | SHANE SPARKS Little Rock, AR, ranked 7948 | $479K |
|
| 4 | NKECHI UGWUH-MOSS Little Rock, AR, ranked 9584 | $81K |
|
| 5 | JOHN DOWNES Little Rock, AR, ranked 10047 | $1.3M |
|
Recent enforcement in AR
All releasesDepartment of Justice and HHS-OIG releases for this state, newest first. Each opens in a new tab.
DOJIndictedNov 19, 2025
Little Rock Psychologist Indicted by Federal Grand Jury for Defrauding Medicare and Arkansas Blue Cross Blue Shield
Banks billed Medicare and Arkansas Blue Cross and Blue Shield for thousands of hours of psychotherapy services that never took place, including sessions for patients seen only once and patients who had died, and created fictitious records to conceal the billing.
DOJSentencedJan 26, 2024
Former Rogers Company Owner and Former CEO Sentenced in Workers’ Comp Fraud/Kickback Conspiracy
The former owner and former CEO of a Rogers-based medical supply and billing company recruited physicians to dispense pain creams and patches to workers' compensation patients in exchange for a split of profits, billed the federal Office of Workers' Compensation Programs and private insurers at markups of 15 to 20 times cost, paid the physicians kickbacks, and shipped medications to two Louisiana physicians who lacked required dispensing licenses.
Referral packet
The packet is a draft for a reviewer. It reads every public record behind this case, states what the records show with a citation for each finding, names the regulation each finding relates to, and lists the ordinary explanations to rule out first. It never asserts intent.