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OpenMed/
OpenMed-PII-Chinese-NomicMed-Large-395M-v1

Name: OpenMed-PII-Chinese-NomicMed-Large-395M-v1
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lightonai/modernbert-embed-large

finetune

apache-2.0

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OpenMed-PII-Chinese-NomicMed-Large-395M-v1

Chinese PII Detection Model | 395M Parameters | Open Source

Model Description

OpenMed-PII-Chinese-NomicMed-Large-395M-v1 is a transformer-based token classification model fine-tuned for Personally Identifiable Information (PII) detection in Chinese text. This model identifies and classifies 54 types of sensitive information including names, addresses, social security numbers, medical record numbers, and more.

Key Features

Chinese-Optimized: Specifically trained on Chinese text for optimal performance
High Accuracy: Achieves strong F1 scores across diverse PII categories
Comprehensive Coverage: Detects 55+ entity types spanning personal, financial, medical, and contact information
Privacy-Focused: Designed for de-identification and compliance with GDPR and other privacy regulations
Production-Ready: Optimized for real-world text processing pipelines

Performance

Evaluated on the Chinese test split (AI4Privacy + synthetic data):

Metric	Score
Micro F1	0.7572
Precision	0.7641
Recall	0.7505
Macro F1	0.4755
Weighted F1	0.7476
Accuracy	0.8896

Top 10 Chinese PII Models

Rank	Model	F1	Precision	Recall
1	OpenMed-PII-Chinese-SnowflakeMed-Large-568M-v1	0.7592	0.7662	0.7523
2	OpenMed-PII-Chinese-BigMed-Large-560M-v1	0.7589	0.7662	0.7517
3	OpenMed-PII-Chinese-NomicMed-Large-395M-v1	0.7572	0.7641	0.7505
4	OpenMed-PII-Chinese-BioClinicalModern-Large-395M-v1	0.7543	0.7577	0.7508
5	OpenMed-PII-Chinese-ModernMed-Large-395M-v1	0.7534	0.7589	0.7479
6	OpenMed-PII-Chinese-SuperClinical-Large-434M-v1	0.7531	0.7508	0.7554
7	OpenMed-PII-Chinese-ClinicalBGE-568M-v1	0.7528	0.7553	0.7504
8	OpenMed-PII-Chinese-SuperClinical-Base-184M-v1	0.7449	0.7432	0.7465
9	OpenMed-PII-Chinese-mLiteClinical-135M-v1	0.7446	0.7498	0.7396
10	OpenMed-PII-Chinese-BioClinicalModern-Base-149M-v1	0.7442	0.7490	0.7395

Supported Entity Types

This model detects 54 PII entity types organized into categories:

Identifiers (22 types)

Entity	Description
`ACCOUNTNAME`	Accountname
`BANKACCOUNT`	Bankaccount
`BIC`	Bic
`BITCOINADDRESS`	Bitcoinaddress
`CREDITCARD`	Creditcard
`CREDITCARDISSUER`	Creditcardissuer
`CVV`	Cvv
`ETHEREUMADDRESS`	Ethereumaddress
`IBAN`	Iban
`IMEI`	Imei
...	and 12 more

Personal Info (11 types)

Entity	Description
`AGE`	Age
`DATEOFBIRTH`	Dateofbirth
`EYECOLOR`	Eyecolor
`FIRSTNAME`	Firstname
`GENDER`	Gender
`HEIGHT`	Height
`LASTNAME`	Lastname
`MIDDLENAME`	Middlename
`OCCUPATION`	Occupation
`PREFIX`	Prefix
...	and 1 more

Contact Info (2 types)

Entity	Description
`EMAIL`	Email
`PHONE`	Phone

Location (9 types)

Entity	Description
`BUILDINGNUMBER`	Buildingnumber
`CITY`	City
`COUNTY`	County
`GPSCOORDINATES`	Gpscoordinates
`ORDINALDIRECTION`	Ordinaldirection
`SECONDARYADDRESS`	Secondaryaddress
`STATE`	State
`STREET`	Street
`ZIPCODE`	Zipcode

Organization (3 types)

Entity	Description
`JOBDEPARTMENT`	Jobdepartment
`JOBTITLE`	Jobtitle
`ORGANIZATION`	Organization

Financial (5 types)

Entity	Description
`AMOUNT`	Amount
`CURRENCY`	Currency
`CURRENCYCODE`	Currencycode
`CURRENCYNAME`	Currencyname
`CURRENCYSYMBOL`	Currencysymbol

Temporal (2 types)

Entity	Description
`DATE`	Date
`TIME`	Time

Usage

Quick Start

python

from transformers import pipeline

# Load the PII detection pipeline
ner = pipeline("ner", model="OpenMed/OpenMed-PII-Chinese-NomicMed-Large-395M-v1", aggregation_strategy="simple")

text = """
患者李明（出生日期：1985/03/15，身份证号：310101198503159876）今日就诊。
联系方式：li.ming@email.cn，电话：+86 138 1234 5678。
地址：上海市浦东新区陆家嘴路123号。
"""

entities = ner(text)
for entity in entities:
    print(f"{entity['entity_group']}: {entity['word']} (score: {entity['score']:.3f})")

De-identification Example

python

def redact_pii(text, entities, placeholder='[REDACTED]'):
    """Replace detected PII with placeholders."""
    # Sort entities by start position (descending) to preserve offsets
    sorted_entities = sorted(entities, key=lambda x: x['start'], reverse=True)
    redacted = text
    for ent in sorted_entities:
        redacted = redacted[:ent['start']] + f"[{ent['entity_group']}]" + redacted[ent['end']:]
    return redacted

# Apply de-identification
redacted_text = redact_pii(text, entities)
print(redacted_text)

Batch Processing

python

from transformers import AutoModelForTokenClassification, AutoTokenizer
import torch

model_name = "OpenMed/OpenMed-PII-Chinese-NomicMed-Large-395M-v1"
model = AutoModelForTokenClassification.from_pretrained(model_name)
tokenizer = AutoTokenizer.from_pretrained(model_name)

texts = [
    "患者李明（出生日期：1985/03/15，身份证号：310101198503159876）今日就诊。",
    "联系方式：li.ming@email.cn，电话：+86 138 1234 5678。",
]

inputs = tokenizer(texts, return_tensors='pt', padding=True, truncation=True)
with torch.no_grad():
    outputs = model(**inputs)
    predictions = torch.argmax(outputs.logits, dim=-1)

Training Details

Dataset

This model was trained on a combination of:

AI4Privacy PII Masking 200K: Multilingual base dataset (200K records across 8 languages)
NVIDIA Nemotron-PII: Seed dataset for synthetic data generation
Synthetic Chinese Data: ~25K high-quality samples generated with locale-specific formatting (身份证号 format, +86 phones, Chinese names, ¥ currency)
Format: BIO-tagged token classification
Labels: 76 BIO tags (54 entity types)

Training Configuration

Max Sequence Length: 512 tokens
Epochs: 3
Framework: Hugging Face Transformers + Trainer API

Intended Use & Limitations

Intended Use

De-identification: Automated redaction of PII in Chinese clinical notes, medical records, and documents
Compliance: Supporting GDPR, and other privacy regulation compliance
Data Preprocessing: Preparing datasets for research by removing sensitive information
Audit Support: Identifying PII in document collections

Limitations

Important: This model is intended as an assistive tool, not a replacement for human review.

False Negatives: Some PII may not be detected; always verify critical applications
Context Sensitivity: Performance may vary with domain-specific terminology
Language: Optimized for Chinese text; may not perform well on other languages

Citation

bibtex

@misc{openmed-pii-2026,
  title = {OpenMed-PII-Chinese-NomicMed-Large-395M-v1: Chinese PII Detection Model},
  author = {OpenMed Science},
  year = {2026},
  publisher = {Hugging Face},
  url = {https://huggingface.co/OpenMed/OpenMed-PII-Chinese-NomicMed-Large-395M-v1}
}

OpenMed/OpenMed-PII-Chinese-NomicMed-Large-395M-v1

OpenMed-PII-Chinese-NomicMed-Large-395M-v1

Model Description

Key Features

Performance

Top 10 Chinese PII Models

Supported Entity Types

Usage

Quick Start

De-identification Example

Batch Processing

Training Details

Dataset

Training Configuration

Intended Use & Limitations

Intended Use

Limitations

Citation

Links

OpenMed/
OpenMed-PII-Chinese-NomicMed-Large-395M-v1